tuna: fstab switch back to our implementation

Change-Id: Id6b73a9b7bbc9589d93542b9ebb9f2e9dee83ada
Signed-off-by: Dan Trifan <jimsth@gmail.com>
Revert "Not sure why this was changed, but it should prolly be like every other device ever..."

cause Google changed https://android.googlesource.com/platform/frameworks/base/+/b749dd853008e89ca608a135157e0ea0057b42ce
https://android.googlesource.com/platform/frameworks/base/+/8db8509e3cfe63a05da5e990164ec3a4576528ca
back to this state https://android.googlesource.com/device/samsung/tuna/+/b74f97a414a73050b563c90ef58993f7e0ec64e0

credits (and complains) go to James Dean (who should get a linux box)

This reverts commit 3a09c2399978b5519ee4ada6ddc2e5bfe4b56281.
Signed-off-by: Dan Trifan <jimsth@gmail.com>

Change-Id: I7126a794f7e061d08ac7bd233c8442b3b27b25b8