Revert "sched/fair: Consider capacity inversion in util_fits_cpu()"

This reverts commit 09129798.

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: Ied83e33a14ff0e09f5f9f288d4e779d8175a8f0f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>