boards: arm64: rpi_4b: Add DTS node for LED_ACT

LED_ACT is the green LED at the top left corner of the RPi 4B board.

Signed-off-by: Chen Xingyu <[email protected]>

boards/arm64/rpi_4b/rpi_4b.dts

@@ -7,17 +7,36 @@
 /dts-v1/;
 
 #include <broadcom/bcm2711.dtsi>
+#include <zephyr/dt-bindings/gpio/gpio.h>
+
 / {
 	model = "Raspberry Pi 4 Model B";
 	compatible = "raspberrypi,4-model-b", "brcm,bcm2838";
 	#address-cells = <1>;
 	#size-cells = <1>;
 
+	aliases {
+		led0 = &led_act;
+	};
+
 	chosen {
 		zephyr,console = &uart1;
 		zephyr,shell-uart = &uart1;
 		zephyr,sram = &sram0;
 	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		led_act: led-act {
+			gpios = <&gpio1 14 GPIO_ACTIVE_HIGH>; /* GPIO 42 */
+			label = "ACT";
+		};
+	};
+};
+
+&gpio1 {
+	status = "okay";
 };
 
 &uart1 {