MIPS: ath79: ar9331_dpt_module: update led nodes

Fit led nodes to the latest naming schema.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/qca/ar9331_dpt_module.dts

@@ -3,6 +3,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
 
 #include "ar9331.dtsi"
 
@@ -22,8 +23,9 @@
 	leds {
 		compatible = "gpio-leds";
 
-		system {
-			label = "dpt-module:green:system";
+		led-0 {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_GREEN>;
 			gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
 			default-state = "off";
 		};