FROMGIT: f2fs: add sysfs nodes to set last_age_weight

Bug: 267580491
(cherry picked from commit d23be468
 https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git

 dev)
Signed-off-by: qixiaoyu1 <qixiaoyu1@xiaomi.com>
Signed-off-by: xiongping1 <xiongping1@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Change-Id: I88b795ec90f4589676daed4919db31b26574c84b