UPSTREAM: f2fs: add a method for calculating the remaining blocks in the...

UPSTREAM: f2fs: add a method for calculating the remaining blocks in the current segment in LFS mode.

In LFS mode, the previous segment cannot use invalid blocks,
so the remaining blocks from the next_blkoff of the current segment
to the end of the section are calculated.

Change-Id: If03173389fb4044cfd751df594b6f61d218521f9
Signed-off-by: yohan.joung <yohan.joung@sk.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit 249ad438)