Provide a proper stub for the !CONFIG_XFS_POSIX_ACL case.

Also use a easy way for xfs_get_acl stub.
Suggested-by: NChristian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: NYang Xu <xuyang2018.jy@fujitsu.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NChristian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: NDarrick J. Wong <djwong@kernel.org>
Signed-off-by: NDave Chinner <david@fromorbit.com>