UPSTREAM: f2fs: fix to update age extent in f2fs_do_zero_range()

We should update age extent in f2fs_do_zero_range() like we
did in f2fs_truncate_data_blocks_range().

Fixes: dfcfcc6d ("f2fs: add block_age-based extent cache")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit a84153f939808102dfa10904aa0f743e734a3e1d)
Change-Id: Iab59f94f792dbab8da7ab597d5a219476370a646
Signed-off-by: zhaoyuenan <amktiao030215@gmail.com>