MAINTAINERS: Add myself to s390 I/O areas

After the recent restructuring, I'd like to volunteer to help
in some of the s390 I/O areas.

Built on "[PATCH RFC v2] MAINTAINERS: split out s390x sections"

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.ibm.com>
Message-Id: <20220112164044.2210508-1-farman@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

MAINTAINERS

@@ -1525,6 +1525,7 @@ S390 Machines
 S390 Virtio-ccw
 M: Halil Pasic <pasic@linux.ibm.com>
 M: Christian Borntraeger <borntraeger@linux.ibm.com>
+M: Eric Farman <farman@linux.ibm.com>
 S: Supported
 F: hw/s390x/
 F: include/hw/s390x/
@@ -1555,6 +1556,7 @@ L: qemu-s390x@nongnu.org
 S390 channel subsystem
 M: Halil Pasic <pasic@linux.ibm.com>
 M: Christian Borntraeger <borntraeger@linux.ibm.com>
+M: Eric Farman <farman@linux.ibm.com>
 S: Supported
 F: hw/s390x/ccw-device.[ch]
 F: hw/s390x/css.c
@@ -1987,6 +1989,7 @@ T: git https://github.com/stefanha/qemu.git block
 virtio-ccw
 M: Cornelia Huck <cohuck@redhat.com>
 M: Halil Pasic <pasic@linux.ibm.com>
+M: Eric Farman <farman@linux.ibm.com>
 S: Supported
 F: hw/s390x/virtio-ccw*.[hc]
 F: hw/s390x/vhost-vsock-ccw.c