drm/virtio: fix endianness in primary_plane_update

virtio_gpu_cmd_transfer_to_host_2d expects x and y
parameters in LE, but virtio_gpu_primary_plane_update
passes in the CPU format instead.

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

drivers/gpu/drm/virtio/virtgpu_plane.c

···
 				(vgdev, handle, 0,
 				 cpu_to_le32(plane->state->src_w >> 16),
 				 cpu_to_le32(plane->state->src_h >> 16),
-				 plane->state->src_x >> 16,
-				 plane->state->src_y >> 16, NULL);
+				 cpu_to_le32(plane->state->src_x >> 16),
+				 cpu_to_le32(plane->state->src_y >> 16), NULL);
 		}
 	} else {
 		handle = 0;