MAINTAINERS: s390/boot: the ipl code and the bios belong together

The s390-ccw bios and the ipl code do work in lock-step. Let us merge
them in the maintainer file.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1540827745-20795-5-git-send-email-borntraeger@de.ibm.com>
Acked-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

MAINTAINERS

@@ -944,10 +944,11 @@ T: git git://github.com/cohuck/qemu.git s390-next
 T: git git://github.com/borntraeger/qemu.git s390-next
 L: qemu-s390x@nongnu.org
 
-S390-ccw Bios
+S390-ccw boot
 M: Christian Borntraeger <borntraeger@de.ibm.com>
 M: Thomas Huth <thuth@redhat.com>
 S: Supported
+F: hw/s390x/ipl.*
 F: pc-bios/s390-ccw/
 F: pc-bios/s390-ccw.img
 T: git git://github.com/borntraeger/qemu.git s390-next