Revert "Revert prior f2fs driver and squash CM updates"

This reverts commit 2b49543c5359050dbdf1dd7e1580d34ee46a35ac.

Change-Id: If5df7ec689b042bd364ae459a46d2902dd15e809
Merge "Revert "Revert prior f2fs driver and squash CM updates"" into kitkat