MAINTAINERS: pick up all vfio_ap docs for VFIO AP maintainers

A new document, Documentation/s390/vfio-ap-locking.rst was added. Make sure
the new document is picked up for the VFIO AP maintainers by using a
wildcard: Documentation/s390/vfio-ap*.
Signed-off-by: NTony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: NAlexander Gordeev <agordeev@linux.ibm.com>

MAINTAINERS

@@ -17453,7 +17453,7 @@ M:	Jason Herne <jjherne@linux.ibm.com>
 L:	linux-s390@vger.kernel.org
 S:	Supported
 W:	http://www.ibm.com/developerworks/linux/linux390/
-F:	Documentation/s390/vfio-ap.rst
+F:	Documentation/s390/vfio-ap*
 F:	drivers/s390/crypto/vfio_ap*
 
 S390 VFIO-CCW DRIVER