Check AServiceManager_isDeclared before AServiceManager_getService

Call AServiceManager_isDeclared before calling AServiceManager_getService
to avoid the waiting time when aidl service is not available.

Bug: 286969060
Test: run VtsHalGatekeeperTarget
(cherry picked from https://android-review.googlesource.com/q/commit:32e1c70f275991ec7fe4d4a2d6e3eeba2a172540)
Merged-In: I7d652a546cb810a601338a68950f01d065aea7a5
Change-Id: I7d652a546cb810a601338a68950f01d065aea7a5

gatekeeperd/gatekeeperd.cpp

@@ -74,9 +74,13 @@ class GateKeeperProxy : public BnGateKeeperService {
   public:
     GateKeeperProxy() {
         clear_state_if_needed_done = false;
-        hw_device = IGatekeeper::getService();
-        ::ndk::SpAIBinder ks2Binder(AServiceManager_getService(gatekeeperServiceName));
-        aidl_hw_device = AidlIGatekeeper::fromBinder(ks2Binder);
+        if (AServiceManager_isDeclared(gatekeeperServiceName)) {
+            ::ndk::SpAIBinder ks2Binder(AServiceManager_waitForService(gatekeeperServiceName));
+            aidl_hw_device = AidlIGatekeeper::fromBinder(ks2Binder);
+        }
+        if (!aidl_hw_device) {
+            hw_device = IGatekeeper::getService();
+        }
         is_running_gsi = android::base::GetBoolProperty(android::gsi::kGsiBootedProp, false);
 
         if (!aidl_hw_device && !hw_device) {