arm64: dts: r8a7795: salvator-x: Configure pins for the DU RGB output

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts

@@ -181,6 +181,8 @@
 };
 
 &du {
+	pinctrl-0 = <&du_pins>;
+	pinctrl-names = "default";
 	status = "okay";
 
 	ports {
@@ -227,6 +229,11 @@
 		function = "avb";
 	};
 
+	du_pins: du {
+		groups = "du_rgb888", "du_sync", "du_oddf", "du_clk_out_0";
+		function = "du";
+	};
+
 	sdhi0_pins: sd0 {
 		groups = "sdhi0_data4", "sdhi0_ctrl";
 		function = "sdhi0";