ARM: shmobile: marzen-reference: Add LED2-LED4 to the device tree

LED2 to LED4 are GPIO LEDs. Add corresponding DT nodes.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7779-marzen-reference.dts

@@ -11,6 +11,7 @@
 
 /dts-v1/;
 /include/ "r8a7779.dtsi"
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "marzen";
@@ -47,6 +48,19 @@ lan0@18000000 {
 		vddvario-supply = <&fixedregulator3v3>;
 		vdd33a-supply = <&fixedregulator3v3>;
 	};
+
+	leds {
+		compatible = "gpio-leds";
+		led2 {
+			gpios = <&gpio4 29 GPIO_ACTIVE_HIGH>;
+		};
+		led3 {
+			gpios = <&gpio4 30 GPIO_ACTIVE_HIGH>;
+		};
+		led4 {
+			gpios = <&gpio4 31 GPIO_ACTIVE_HIGH>;
+		};
+	};
 };
 
 &pfc {