virtio_test: fixup for vq reset

Fix virtio test compilation failure caused by vq reset.

../../drivers/virtio/virtio_ring.c: In function ‘vring_create_virtqueue_packed’:
../../drivers/virtio/virtio_ring.c:1999:8: error: ‘struct virtqueue’ has no member named ‘reset’
1999 | vq->vq.reset = false;
| ^
../../drivers/virtio/virtio_ring.c: In function ‘__vring_new_virtqueue’:
../../drivers/virtio/virtio_ring.c:2493:8: error: ‘struct virtqueue’ has no member named ‘reset’
2493 | vq->vq.reset = false;
| ^
../../drivers/virtio/virtio_ring.c: In function ‘virtqueue_resize’:
../../drivers/virtio/virtio_ring.c:2587:18: error: ‘struct virtqueue’ has no member named ‘num_max’
2587 | if (num > vq->vq.num_max)
| ^
../../drivers/virtio/virtio_ring.c:2596:11: error: ‘struct virtio_device’ has no member named ‘config’
2596 | if (!vdev->config->disable_vq_and_reset)
| ^~
../../drivers/virtio/virtio_ring.c:2599:11: error: ‘struct virtio_device’ has no member named ‘config’
2599 | if (!vdev->config->enable_vq_after_reset)
| ^~
../../drivers/virtio/virtio_ring.c:2602:12: error: ‘struct virtio_device’ has no member named ‘config’
2602 | err = vdev->config->disable_vq_and_reset(_vq);
| ^~
../../drivers/virtio/virtio_ring.c:2614:10: error: ‘struct virtio_device’ has no member named ‘config’
2614 | if (vdev->config->enable_vq_after_reset(_vq))
| ^~
make: *** [<builtin>: virtio_ring.o] Error 1

Signed-off-by: Xuan Zhuo <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>

tools/virtio/linux/virtio.h

···
 	u64 features;
 	struct list_head vqs;
 	spinlock_t vqs_list_lock;
+	const struct virtio_config_ops *config;
 };
 
 struct virtqueue {
···
 	struct virtio_device *vdev;
         unsigned int index;
         unsigned int num_free;
+	unsigned int num_max;
 	void *priv;
+	bool reset;
 };
 
 /* Interfaces exported by virtio_ring. */

tools/virtio/linux/virtio_config.h

···
 #include <linux/virtio.h>
 #include <uapi/linux/virtio_config.h>
 
+struct virtio_config_ops {
+	int (*disable_vq_and_reset)(struct virtqueue *vq);
+	int (*enable_vq_after_reset)(struct virtqueue *vq);
+};
+
 /*
  * __virtio_test_bit - helper to test feature bits. For use by transports.
  *                     Devices should normally use virtio_has_feature,