FS: import F2FS

Signed-off-by: Paul Reioux <reioux@gmail.com>
f2fs: data: AIO optimization compatibility fixup

Signed-off-by: Paul Reioux <reioux@gmail.com>
Add f2fs to config and typo fix

Change-Id: I7394a95cf41bd8fc02222ad78f83bf1a3ce025bc