f2fs: disable fsck check

fsck.f2fs does not fix any inconsistencies "yet".

Disable fsck routine as this is just wasting time consumed to mount f2fs volumes.

The kernel can determine if a f2fs volume is too damaged that it shouldn't get mounted.

We should wait for f2fs-tools version higher than v1.3.0.
(fsck.f2fs for fixing inconsistencies is a work-in-progress)

References:
https://github.com/torvalds/linux/blob/master/Documentation/filesystems/f2fs.txt#L261
https://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs-tools.git

Change-Id: I7e0a4662ac70860fe139bb9331b7aee1ad76220f
Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>