scx_lavd: Revert "scx_lavd: Preemption when ops.select_cpu() was skipped" #6501

Job	Run time
build-kernel	15s
lint	14s
pages	0s
build-kernel-nix / build-kernel	4s
rust-test-core (scx_loader)	5m 55s
layered-matrix (scx_layered, --disable-topology=false)	3m 5s
integration-test (scx_bpfland)	4m 33s
integration-test (scx_lavd)	4m 51s
layered-matrix (scx_layered, --disable-topology=false, --disable-antistall)	3m 7s
rust-test-core (scx_rustland_core)	8m 53s
integration-test (scx_layered)	4m 24s
rust-test-schedulers (scx_bpfland)	10m 7s
layered-matrix (scx_layered, --disable-topology=true)	3m 4s
rust-test-core (scx_stats)	3m 27s
integration-test (scx_rlfifo)	3m 0s
rust-test-schedulers (scx_lavd)	10m 55s
layered-matrix (scx_layered, --disable-topology=true, --disable-antistall)	3m 7s
rust-test-core (scx_utils)	10m 3s
integration-test (scx_rustland)	4m 45s
rust-test-schedulers (scx_layered)	9m 32s
integration-test (scx_rusty)	3m 41s
rust-test-schedulers (scx_rlfifo)	10m 5s
rust-test-schedulers (scx_rustland)	11m 15s
rust-test-schedulers (scx_rusty)	9m 23s
	2h 7m 45s

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