jbd2: fix kabi broken in struct journal_s

hulk inclusion
category: bugfix
bugzilla: 50788
CVE: NA
---------------------------

fcf37549 ("jbd2: ensure abort the journal if detect IO error when
writing original buffer back") add 'j_atomic_flags', and 4ba3fcdd
("jbd2,ext4: add a shrinker to release checkpointed buffers") add
j_shrinker_*, which can lead lots of kabi broken on jbd2 module.

Fix it by add a wrapper.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Yang Erkun <yangerkun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>