cifs: missing directory in MAINTAINERS file

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) <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

MAINTAINERS

···
 F:	Documentation/admin-guide/cifs/
 F:	fs/cifs/
 F:	fs/smbfs_common/
+F:	include/uapi/linux/cifs
 
 COMPACTPCI HOTPLUG CORE
 M:	Scott Murray <[e-mail]>