Add support to format as F2FS.

Change-Id: I05b97970990d47cd028c1d1899a3c98e7d3a6ab9

Credits: aeroevan

Signed-off-by: dragon <dragon7780@hotmail.nl>
Conflicts:
	extendedcommands.c
Fix mkfs.f2fs calling in roots

Change-Id: I4991732be70a7e9ae7e87fa1395e89b315717049

Conflicts:
	roots.c