Revert "mm: fix struct page layout on 32-bit systems"

This reverts commit ecdf893c as it
breaks the kernel abi and it's nothing we care about in Android GKI
systems as they are all 64bit kernels.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ib077886a965010f3b649776ee3e4ded5c64e59ae