Revert "mm/page_alloc: Separate THP PCP into movable and non-movable categories"

This reverts commit 447434ea which is
commit bf14ed81 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: Iaa26387f63a15f47d85e04a1317c08e2d0137768
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>