recovery and tools f2fs support

Change-Id: I9dd054cabc93d6a2b8988f6e1d573382545a2063
fstab: /data and /cache f2fs support

Change-Id: I99fb305676e7ad0b8a1507528a3f760ae851772f
fstab: /cache unrecognized mount option errors=recover

Change-Id: Ia2568aef9d7ccdbd5cefd8be4f3f061d89d7c458