s390x/MAINTAINERS: add mailing list

There's a new qemu-s390x@nongnu.org mailing list: add it to the
s390 sections.
Reviewed-by: NThomas Huth <thuth@redhat.com>
Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

MAINTAINERS

@@ -216,6 +216,7 @@ S: Maintained
 F: target/s390x/
 F: hw/s390x/
 F: disas/s390.c
+L: qemu-s390x@nongnu.org
 
 SH4
 M: Aurelien Jarno <aurelien@aurel32.net>
@@ -310,6 +311,7 @@ F: include/hw/s390x/s390_flic.h
 F: gdb-xml/s390*.xml
 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
 
 X86
 M: Paolo Bonzini <pbonzini@redhat.com>
@@ -808,6 +810,7 @@ F: pc-bios/s390-ccw.img
 F: default-configs/s390x-softmmu.mak
 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
 
 UniCore32 Machines
 -------------
@@ -1032,6 +1035,7 @@ F: hw/vfio/ccw.c
 F: hw/s390x/s390-ccw.c
 F: include/hw/s390x/s390-ccw.h
 T: git git://github.com/cohuck/qemu.git s390-next
+L: qemu-s390x@nongnu.org
 
 vhost
 M: Michael S. Tsirkin <mst@redhat.com>
@@ -1075,6 +1079,7 @@ S: Supported
 F: hw/s390x/virtio-ccw.[hc]
 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
 
 virtio-input
 M: Gerd Hoffmann <kraxel@redhat.com>
@@ -1718,6 +1723,7 @@ M: Richard Henderson <rth@twiddle.net>
 S: Maintained
 F: tcg/s390/
 F: disas/s390.c
+L: qemu-s390x@nongnu.org
 
 SPARC target
 S: Odd Fixes