Revert "libpagemap: Mask off page shift to get page frame number"

This reverts commit 4bf06a51869f49d7ee3fb0163a2517ec5e33ba1f.

Bug: 17360804
Bug: 17332389
Change-Id: I7e4d55215f391f5b3f71388943e9d95e5eff6f81
1 file changed