db845c: Unify fstab files to fix issues w/ adb remount am: e53665ed85 am: 222ed0b556 am: 4066506792 am: 7ba0e56294

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

Change-Id: I702d213251562526b664e3c70aa1f33356fe64f9