Use new APIs to dynamically allocate the f2fs-shrinker.
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
CC: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
CC: Chao Yu <chao@xxxxxxxxxx>
CC: linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx