Revert "ANDROID: sched: Disable find_best_target() by default"

This reverts commit 549020c8.

This is a preparation change for merging android-4.19.32 into
msm-4.19 branch.

This change affects scheduler behavior that can lead to boot time
regression.

Change-Id: Iedc341fb5d07e7ba1dd37e4b9b4474a84a3afe11
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>