f2fs-tools: support zoned ufs devices

Support zoned ufs devices.
1. implemented out-place updates
2. keep roll forward recovery intact
3. open block device files with O_SYNC to comply with zoned device's
   write rules

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>