fstab: support ext4 and f2fs data and cache

Adapted from http://review.cyanogenmod.org/#/c/77234/

Change-Id: Ib91876ef7da852fb2b7b83f2da881af422fa5419
overlay: SystemUI moved to common

Change-Id: If6729c2b9d7156e519c6fc11da70fd958fd60926
Revert "fstab: support ext4 and f2fs data and cache"

This reverts commit e8ee2c9eaa02474f19b2b4e5f8b82a4c44527c9d.

Not ready yet.