MAINTAINERS: add tools/virtio/ under virtio

This should help make sure patches go to the correct list.

Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
diff --git a/MAINTAINERS b/MAINTAINERS
index 3a7b07f..0680f44 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8758,6 +8758,7 @@
 L:	[email protected]
 S:	Maintained
 F:	drivers/virtio/
+F:	tools/virtio/
 F:	drivers/net/virtio_net.c
 F:	drivers/block/virtio_blk.c
 F:	include/linux/virtio_*.h