Revert "sched/fair: Fix value reported by hot tasks pulled in /proc/schedstat"

This reverts commit a18682cc which is
commit a430d99e upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ia71eb1867950bae93b6c426a596d584716137b29
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>