cifs: missing directory in MAINTAINERS file

[ Upstream commit 5dd8ce24 ]

The include/uapi/linux/cifs directory (not just fs/cifs and
fs/smbfs_common) should be included in cifs entry in the
MAINTAINERS file.

Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Stable-dep-of: df9d70c1 ("cifs: if deferred close is disabled then close files immediately")
Signed-off-by: Sasha Levin <sashal@kernel.org>