scx_lavd: Don't try preemption for greedy tasks #6337

Job	Run time
pages	0s
lint	6s
build-kernel	11s
rust-test-core (scx_loader)	5m 29s
rust-test-schedulers (scx_bpfland)	10m 31s
rust-test-core (scx_rustland_core)	8m 8s
layered-matrix (scx_layered, --disable-topology=false)	3m 13s
rust-test-schedulers (scx_lavd)	10m 16s
integration-test (scx_bpfland)	3m 49s
rust-test-core (scx_stats)	3m 24s
layered-matrix (scx_layered, --disable-topology=false, --disable-antistall)	3m 53s
integration-test (scx_lavd)	4m 31s
rust-test-core (scx_utils)	9m 28s
layered-matrix (scx_layered, --disable-topology=true)	3m 15s
integration-test (scx_layered)	3m 57s
layered-matrix (scx_layered, --disable-topology=true, --disable-antistall)	3m 9s
rust-test-schedulers (scx_layered)	9m 18s
integration-test (scx_rlfifo)	3m 40s
rust-test-schedulers (scx_rlfifo)	10m 46s
integration-test (scx_rustland)	4m 34s
rust-test-schedulers (scx_rustland)	10m 42s
integration-test (scx_rusty)	3m 43s
rust-test-schedulers (scx_rusty)	8m 49s
	2h 4m 52s

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