vdpa: Add missing comment for virtqueue count

Add missing comment for number of virtqueue.

Signed-off-by: Parav Pandit <[email protected]>
Reviewed-by: Eli Cohen <[email protected]>
Acked-by: Jason Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michael S. Tsirkin <[email protected]>

Author: paravmellanox

include/linux/vdpa.h

@@ -42,6 +42,7 @@ struct vdpa_vq_state {
  * @config: the configuration ops for this device.
  * @index: device index
  * @features_valid: were features initialized? for legacy guests
+ * @nvqs: maximum number of supported virtqueues
  */
 struct vdpa_device {
 	struct device dev;