Revert "sched/fair: Fixes for capacity inversion detection"

This reverts commit 4735b6f7.

It breaks the Android kernel abi, so revert it.  If it needs to come
back later, it can do so in an abi-safe way.

Bug: 161946584
Cc: Qais Yousef <qyousef@google.com>
Change-Id: I91e7a2222c06516f4df460603cc27cf7c1106823
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>