Revert "Make gpe-boot.img and include as system/gpe-boot.img for install"

This reverts commit 7b5b6773e269afc0f89f07e7492a193d7b068459.
Swap fstab at init if GPE

Change-Id: Ied69c3c3cb7bbfb561120862e48dfcf22458e843
root: Use busybox blkid for GPE checks

Change-Id: I7456a8ea4faf997aca88efa0844bb0d11f97e48a