Revert "ANDROID: sched: Prevent unnecessary active balance of single task in sched group"

This reverts commit 7846cccb.

We want to back-out the eas-dev merge that happened in the tree after
5.3-rc1 as those patches "should" all be in Linus's tree now.

This is done to handle the merge conflicts with 5.4-rc1.

Cc: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Idb2a1eeb907c2ecbf29c71462594f5966a268a5a