media: v4l2-fwnode: Make number of data lanes a character

The maximum is currently four (4). No short is needed.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

include/media/v4l2-fwnode.h

@@ -40,7 +40,7 @@ struct v4l2_fwnode_bus_mipi_csi2 {
 	unsigned int flags;
 	unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES];
 	unsigned char clock_lane;
-	unsigned short num_data_lanes;
+	unsigned char num_data_lanes;
 	bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
 };