drm: rcar-du: Enable DU0 to DPAD connection on R8A7791

The DPAD RGB output can be driven by both DU0 and DU1 on R8A7791. Mark
the DU0 connection as possible.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_drv.c

@@ -93,7 +93,7 @@ static const struct rcar_du_device_info rcar_du_r8a7791_info = {
 		 * (currently unsupported) TCON output.
 		 */
 		[RCAR_DU_OUTPUT_DPAD0] = {
-			.possible_crtcs = BIT(1),
+			.possible_crtcs = BIT(1) | BIT(0),
 			.encoder_type = DRM_MODE_ENCODER_NONE,
 			.port = 0,
 		},