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

This reverts commit 98762616.

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
Change-Id: Ia49398fa009014e2fb2d2133d99d46dbed02b528
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>