MAINTAINERS: s390/virtio-ccw: drop Christian, add Halil

Halil does all the work anyway.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1540827745-20795-3-git-send-email-borntraeger@de.ibm.com>
Acked-by: NHalil Pasic <pasic@linux.ibm.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

MAINTAINERS

@@ -1263,7 +1263,7 @@ T: git git://github.com/stefanha/qemu.git block
 
 virtio-ccw
 M: Cornelia Huck <cohuck@redhat.com>
-M: Christian Borntraeger <borntraeger@de.ibm.com>
+M: Halil Pasic <pasic@linux.ibm.com>
 S: Supported
 F: hw/s390x/virtio-ccw*.[hc]
 F: hw/s390x/vhost-vsock-ccw.c