virtio_9p: correct tags for config space fields

Tag config space fields as having virtio endian-ness.

Signed-off-by: Michael S. Tsirkin <[e-mail]>
Reviewed-by: Cornelia Huck <[e-mail]>

include/uapi/linux/virtio_9p.h

···
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE. */
-#include <linux/types.h>
+#include <linux/virtio_types.h>
 #include <linux/virtio_ids.h>
 #include <linux/virtio_config.h>
 
···
 
 struct virtio_9p_config {
 	/* length of the tag name */
-	__u16 tag_len;
+	__virtio16 tag_len;
 	/* non-NULL terminated tag name */
 	__u8 tag[0];
 } __attribute__((packed));