f2fs: set checkpoint_merge by default

Once we introduced checkpoint_merge, we've seen some contention w/o the option.
In order to avoid it, let's set it by default.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2021-04-01 17:25:20 -07:00
commit b5d15199a2