ath79: convert to new LED color/function format where possible

Initial conversion to new LED color/function format
and drop label format where possible. The same label
is composed at runtime.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

target/linux/ath79/dts/qca9558_librerouter_librerouter-v1.dts

@@ -4,6 +4,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
 
 / {
 	compatible = "librerouter,librerouter-v1", "qca,qca9558";
@@ -32,7 +33,8 @@
 		};
 
 		status_blue {
-			label = "blue:status";
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_BLUE>;
 			gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
 		};
 	};