MAiNTAINERS: add Paolo, Stefan for virtio blk/scsi

Jason doesn't really have the time to review blk/scsi
patches. Paolo and Setfan agreed to help out.

Thanks guys!

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

MAINTAINERS

@@ -16509,7 +16509,7 @@ F:	drivers/char/virtio_console.c
 F:	include/linux/virtio_console.h
 F:	include/uapi/linux/virtio_console.h
 
-VIRTIO CORE, NET AND BLOCK DRIVERS
+VIRTIO CORE AND NET DRIVERS
 M:	"Michael S. Tsirkin" <mst@redhat.com>
 M:	Jason Wang <jasowang@redhat.com>
 L:	virtualization@lists.linux-foundation.org
@@ -16524,6 +16524,19 @@ F:	include/uapi/linux/virtio_*.h
 F:	drivers/crypto/virtio/
 F:	mm/balloon_compaction.c
 
+VIRTIO BLOCK AND SCSI DRIVERS
+M:	"Michael S. Tsirkin" <mst@redhat.com>
+M:	Jason Wang <jasowang@redhat.com>
+R:	Paolo Bonzini <pbonzini@redhat.com>
+R:	Stefan Hajnoczi <stefanha@redhat.com>
+L:	virtualization@lists.linux-foundation.org
+S:	Maintained
+F:	drivers/block/virtio_blk.c
+F:	drivers/scsi/virtio_scsi.c
+F:	include/uapi/linux/virtio_blk.h
+F:	include/uapi/linux/virtio_scsi.h
+F:	drivers/vhost/scsi.c
+
 VIRTIO CRYPTO DRIVER
 M:	Gonglei <arei.gonglei@huawei.com>
 L:	virtualization@lists.linux-foundation.org