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>
configs: add f2fs

Change-Id: I211aecc62eff38c9732d3e50803017c5b189206f
Signed-off-by: rebelos <ks50497@gmail.com>