Revert "BACKPORT: sched/rt: Make RT capacity-aware"

This reverts commit cdadd914.

This is a preparation change for merging android-4.19.110 into
msm-4.19 branch.

Logic for RT task placement has already been added.

Change-Id: I2373371283cd6fe318047ea9635ed4db7d0c020a
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>