LU-15420 llite: add rcu argument to ->get_acl() callback

LU-15420 llite: add rcu argument to ->get_acl() callback

Kernel 5.15 commit 0cad6246621b5887d5b33fea84219d2a71f2f99a
added a rcu argument to the ->get_acl() callback.

Lustre-change: https://review.whamcloud.com/46086
Lustre-commit: TBD (from 66d55d4c3c93837b725d4cfece30a30683082b56)

Test-Parameters: trivial
Change-Id: Icd711b38dda1a5a3c56bd631fa2edd94eab3572c
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/46289
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>