drm/rcar-du: Rename platform data fields to match what they describe

The struct rcar_du_encoder_data encoder::field describes the encoder
type, and the rcar_du_encoder_lvds_data and rcar_du_encoder_vga_data
structures describe connector properties. Rename them accordingly.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index 15a5643..0d0375c 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -137,7 +137,7 @@
 	switch (type) {
 	case RCAR_DU_ENCODER_LVDS:
 		return rcar_du_lvds_connector_init(rcdu, renc,
-						   &data->u.lvds.panel);
+						   &data->connector.lvds.panel);
 
 	case RCAR_DU_ENCODER_VGA:
 		return rcar_du_vga_connector_init(rcdu, renc);