LU-16958 llite: migrate vs regular ops deadlock

LU-16958 llite: migrate vs regular ops deadlock

When it need to lock inode in lov_conf_set(), it could have hold
inode's lli_layout_mutex, we need unlock the layout mutex before
taking its inode lock to keep the lock order.

Fixes: 51d62f2122f ("LU-16637 llite: call truncate_inode_pages() in inode lock")
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I7ee58039a6d31daefc625ac571a52baf112f8151
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51641
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>