arm64: dts: add LED nodes for hi6220-hikey

Add LED nodes for hi6220-hikey. There are total 6 LEDs on HiKey.
Four general purposed, one for WiFi activity, and one for Bluetooth
activity.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts

@@ -66,6 +66,47 @@
 			status = "ok";
 		};
 	};
+
+	leds {
+		compatible = "gpio-leds";
+		user_led4 {
+			label = "user_led4";
+			gpios = <&gpio4 0 0>; /* <&gpio_user_led_1>; */
+			linux,default-trigger = "heartbeat";
+		};
+
+		user_led3 {
+			label = "user_led3";
+			gpios = <&gpio4 1 0>; /* <&gpio_user_led_2>; */
+			linux,default-trigger = "mmc0";
+		};
+
+		user_led2 {
+			label = "user_led2";
+			gpios = <&gpio4 2 0>; /* <&gpio_user_led_3>; */
+			linux,default-trigger = "mmc1";
+		};
+
+		user_led1 {
+			label = "user_led1";
+			gpios = <&gpio4 3 0>; /* <&gpio_user_led_4>; */
+			linux,default-trigger = "cpu0";
+		};
+
+		wlan_active_led {
+			label = "wifi_active";
+			gpios = <&gpio3 5 0>; /* <&gpio_wlan_active_led>; */
+			linux,default-trigger = "phy0tx";
+			default-state = "off";
+		};
+
+		bt_active_led {
+			label = "bt_active";
+			gpios = <&gpio4 7 0>; /* <&gpio_bt_active_led>; */
+			linux,default-trigger = "hci0rx";
+			default-state = "off";
+		};
+	};
 };
 
 &uart2 {