Revert "Don't copy fstab as we have genfstab"

This reverts commit d0717b478b91bb0ef0ea9b0cb9df4cbc080b205a.
Revert "Add genfstab for F2FS"

This reverts commit 0406f7be40bf8be6a1b45b2f1121595a1c2e8750.