MAINTAINERS: Add an entry for virtio header files

Files in the include/hw/virtio/ folder should be included in the
"virtio" sections of the MAINTAINERS file.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index dc0aa54..524963f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -877,6 +877,7 @@
 S: Supported
 F: hw/*/virtio*
 F: net/vhost-user.c
+F: include/hw/virtio/
 
 virtio-9p
 M: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>