Revert "sched/fair: Detect capacity inversion"

This reverts commit 30f04dd5.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I576fa3894406ad6db3d4eafe5c08572d20c71902