MAINTAINERS: Add more s390 files

Cc: Alexander Graf <agraf@suse.de>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index cbe29d0..9503531 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -577,6 +577,7 @@
 M: Christian Borntraeger <borntraeger@de.ibm.com>
 M: Alexander Graf <agraf@suse.de>
 S: Supported
+F: hw/char/sclp*.[hc]
 F: hw/s390x/s390-virtio-ccw.c
 F: hw/s390x/css.[hc]
 F: hw/s390x/sclp*.[hc]