db845c: Unify fstab files to fix issues w/ adb remount am: e53665ed85 am: 222ed0b556 am: 4066506792

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1449169

Change-Id: I6ae76226a696adeeaa8b9116e115b34e5a7b661b