arista: Fix device directories for 7800R3A linecard SKUs (#21512)

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#### Why I did it

Each 7800R3A SKU has a different name which must be present in the platform.json file. Previously each SKU directory was symlinked together causing sonic-mgmt platform API tests to fail. By instead symlinking the common files in each directory, we can have the `platform.json` file be different per SKU as required.

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it

I removed the symlinks and instead created separate directories per SKU.

#### How to verify it

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device/arista/x86_64-arista_7800r3a_36d2_lc/platform.json

@@ -1,6 +1,6 @@
 {
     "chassis": {
-        "name": "7800R3A-36DM2-LC",
+        "name": "7800R3A-36D2-LC",
         "components": [
             {
                 "name": "Aboot()"

device/arista/x86_64-arista_7800r3a_36d2_lc/platform_components.json

@@ -1,6 +1,6 @@
 {
     "chassis": {
-        "7800R3A-36DM2-LC": {
+        "7800R3A-36D2-LC": {
             "component": {
                 "Aboot()": {},
                 "Scd(addr=0000:00:18.7)": {},

device/arista/x86_64-arista_7800r3a_36d_lc/Arista-7800R3A-36D-C36

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/Arista-7800R3A-36D-C36

device/arista/x86_64-arista_7800r3a_36d_lc/Arista-7800R3A-36D-C72

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/Arista-7800R3A-36D-C72

device/arista/x86_64-arista_7800r3a_36d_lc/Arista-7800R3A-36D-D36

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/Arista-7800R3A-36D-D36

device/arista/x86_64-arista_7800r3a_36d_lc/asic.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/asic.conf

device/arista/x86_64-arista_7800r3a_36d_lc/chassisdb.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/chassisdb.conf

device/arista/x86_64-arista_7800r3a_36d_lc/default_sku

@@ -0,0 +1 @@
+Arista-7800R3A-36D-C72 t1

device/arista/x86_64-arista_7800r3a_36d_lc/media_settings.json

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/media_settings.json

device/arista/x86_64-arista_7800r3a_36d_lc/pcie.yaml

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/pcie.yaml

device/arista/x86_64-arista_7800r3a_36d_lc/platform.json

@@ -0,0 +1,140 @@
+{
+    "chassis": {
+        "name": "7800R3A-36D-LC",
+        "components": [
+            {
+                "name": "Aboot()"
+            },
+            {
+                "name": "Scd(addr=0000:00:18.7)"
+            },
+            {
+                "name": "Scd(addr=0000:08:00.0)"
+            }
+        ],
+        "fans": [],
+        "fan_drawers": [],
+        "psus": [],
+        "thermals": [
+            {
+                "name": "Cpu temp sensor",
+                "controllable": false
+            },
+            {
+                "name": "Cpu SBTSI",
+                "controllable": false
+            }
+        ],
+        "sfps": [
+            {
+                "name": "osfp1"
+            },
+            {
+                "name": "osfp2"
+            },
+            {
+                "name": "osfp3"
+            },
+            {
+                "name": "osfp4"
+            },
+            {
+                "name": "osfp5"
+            },
+            {
+                "name": "osfp6"
+            },
+            {
+                "name": "osfp7"
+            },
+            {
+                "name": "osfp8"
+            },
+            {
+                "name": "osfp9"
+            },
+            {
+                "name": "osfp10"
+            },
+            {
+                "name": "osfp11"
+            },
+            {
+                "name": "osfp12"
+            },
+            {
+                "name": "osfp13"
+            },
+            {
+                "name": "osfp14"
+            },
+            {
+                "name": "osfp15"
+            },
+            {
+                "name": "osfp16"
+            },
+            {
+                "name": "osfp17"
+            },
+            {
+                "name": "osfp18"
+            },
+            {
+                "name": "osfp19"
+            },
+            {
+                "name": "osfp20"
+            },
+            {
+                "name": "osfp21"
+            },
+            {
+                "name": "osfp22"
+            },
+            {
+                "name": "osfp23"
+            },
+            {
+                "name": "osfp24"
+            },
+            {
+                "name": "osfp25"
+            },
+            {
+                "name": "osfp26"
+            },
+            {
+                "name": "osfp27"
+            },
+            {
+                "name": "osfp28"
+            },
+            {
+                "name": "osfp29"
+            },
+            {
+                "name": "osfp30"
+            },
+            {
+                "name": "osfp31"
+            },
+            {
+                "name": "osfp32"
+            },
+            {
+                "name": "osfp33"
+            },
+            {
+                "name": "osfp34"
+            },
+            {
+                "name": "osfp35"
+            },
+            {
+                "name": "osfp36"
+            }
+        ]
+    },
+    "interfaces": {}
+}

device/arista/x86_64-arista_7800r3a_36d_lc/platform_asic

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/platform_asic

device/arista/x86_64-arista_7800r3a_36d_lc/platform_components.json

@@ -0,0 +1,11 @@
+{
+    "chassis": {
+        "7800R3A-36D-LC": {
+            "component": {
+                "Aboot()": {},
+                "Scd(addr=0000:00:18.7)": {},
+                "Scd(addr=0000:08:00.0)": {}
+            }
+        }
+    }
+}

device/arista/x86_64-arista_7800r3a_36d_lc/platform_env.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/platform_env.conf

device/arista/x86_64-arista_7800r3a_36d_lc/plugins

@@ -0,0 +1 @@
+../x86_64-arista_common/plugins

device/arista/x86_64-arista_7800r3a_36d_lc/pmon_daemon_control.json

@@ -0,0 +1 @@
+../x86_64-arista_common/pmon_daemon_control.json

device/arista/x86_64-arista_7800r3a_36d_lc/sensors.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/sensors.conf

device/arista/x86_64-arista_7800r3a_36d_lc/services.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/services.conf

device/arista/x86_64-arista_7800r3a_36d_lc/startup-tsa-tsb.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/startup-tsa-tsb.conf

device/arista/x86_64-arista_7800r3a_36d_lc/system_health_monitoring_config.json

@@ -0,0 +1 @@
+../x86_64-arista_common/system_health_monitoring_config.json

device/arista/x86_64-arista_7800r3a_36d_lc/thermal_policy.json

@@ -0,0 +1 @@
+../x86_64-arista_common/thermal_policy.json

device/arista/x86_64-arista_7800r3a_36d_lc/use_pci_id_chassis

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/use_pci_id_chassis

device/arista/x86_64-arista_7800r3a_36dm2_lc/Arista-7800R3A-36DM2-C36

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/Arista-7800R3A-36DM2-C36

device/arista/x86_64-arista_7800r3a_36dm2_lc/Arista-7800R3A-36DM2-C72

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/Arista-7800R3A-36DM2-C72

device/arista/x86_64-arista_7800r3a_36dm2_lc/Arista-7800R3A-36DM2-D36

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/Arista-7800R3A-36DM2-D36

device/arista/x86_64-arista_7800r3a_36dm2_lc/asic.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/asic.conf

device/arista/x86_64-arista_7800r3a_36dm2_lc/chassisdb.conf

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/chassisdb.conf

device/arista/x86_64-arista_7800r3a_36dm2_lc/default_sku

@@ -0,0 +1 @@
+Arista-7800R3A-36DM2-C72 t1

device/arista/x86_64-arista_7800r3a_36dm2_lc/media_settings.json

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/media_settings.json

device/arista/x86_64-arista_7800r3a_36dm2_lc/pcie.yaml

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/pcie.yaml

device/arista/x86_64-arista_7800r3a_36dm2_lc/platform.json

@@ -0,0 +1,140 @@
+{
+    "chassis": {
+        "name": "7800R3A-36DM2-LC",
+        "components": [
+            {
+                "name": "Aboot()"
+            },
+            {
+                "name": "Scd(addr=0000:00:18.7)"
+            },
+            {
+                "name": "Scd(addr=0000:08:00.0)"
+            }
+        ],
+        "fans": [],
+        "fan_drawers": [],
+        "psus": [],
+        "thermals": [
+            {
+                "name": "Cpu temp sensor",
+                "controllable": false
+            },
+            {
+                "name": "Cpu SBTSI",
+                "controllable": false
+            }
+        ],
+        "sfps": [
+            {
+                "name": "osfp1"
+            },
+            {
+                "name": "osfp2"
+            },
+            {
+                "name": "osfp3"
+            },
+            {
+                "name": "osfp4"
+            },
+            {
+                "name": "osfp5"
+            },
+            {
+                "name": "osfp6"
+            },
+            {
+                "name": "osfp7"
+            },
+            {
+                "name": "osfp8"
+            },
+            {
+                "name": "osfp9"
+            },
+            {
+                "name": "osfp10"
+            },
+            {
+                "name": "osfp11"
+            },
+            {
+                "name": "osfp12"
+            },
+            {
+                "name": "osfp13"
+            },
+            {
+                "name": "osfp14"
+            },
+            {
+                "name": "osfp15"
+            },
+            {
+                "name": "osfp16"
+            },
+            {
+                "name": "osfp17"
+            },
+            {
+                "name": "osfp18"
+            },
+            {
+                "name": "osfp19"
+            },
+            {
+                "name": "osfp20"
+            },
+            {
+                "name": "osfp21"
+            },
+            {
+                "name": "osfp22"
+            },
+            {
+                "name": "osfp23"
+            },
+            {
+                "name": "osfp24"
+            },
+            {
+                "name": "osfp25"
+            },
+            {
+                "name": "osfp26"
+            },
+            {
+                "name": "osfp27"
+            },
+            {
+                "name": "osfp28"
+            },
+            {
+                "name": "osfp29"
+            },
+            {
+                "name": "osfp30"
+            },
+            {
+                "name": "osfp31"
+            },
+            {
+                "name": "osfp32"
+            },
+            {
+                "name": "osfp33"
+            },
+            {
+                "name": "osfp34"
+            },
+            {
+                "name": "osfp35"
+            },
+            {
+                "name": "osfp36"
+            }
+        ]
+    },
+    "interfaces": {}
+}

device/arista/x86_64-arista_7800r3a_36dm2_lc/platform_asic

@@ -0,0 +1 @@
+../x86_64-arista_7800r3a_36d2_lc/platform_asic