fsck.f2fs: select to update the latest valid summary
fsck.f2fs: select to update the latest valid summary

If two dnode blocks indicate one block address, it needs to keep the latest
valid address selectively.

Change-Id: I82574293da9999994da7a3b3fb63798f33dfb8ef
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

Yu-AndroidM/android_external_f2fs-tools,Yu-AndroidM/android_external_f2fs-tools