virtio-net: pass Device-TLB enable/disable events to vhost

If vhost is enabled for virtio-net, Device-TLB enable/disable events
must be passed to vhost for proper IOMMU unmap flag selection.

Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230626091258.24453-3-viktor@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit cd9b834)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/net/virtio-net.c

@@ -3888,6 +3888,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data)
     vdc->vmsd = &vmstate_virtio_net_device;
     vdc->primary_unplug_pending = primary_unplug_pending;
     vdc->get_vhost = virtio_net_get_vhost;
+    vdc->toggle_device_iotlb = vhost_toggle_device_iotlb;
 }
 
 static const TypeInfo virtio_net_info = {