ath79: fix leds description for EnGenius EPG5000

Align the LEDs deffinition with MACH file present in ar71xx target which
has the correct LED functions and colors adescription.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

target/linux/ath79/dts/qca9558_engenius_epg5000.dts

@@ -30,11 +30,6 @@
 			default-state = "on";
 		};
 
-		wan {
-			label = "epg5000:blue:wan";
-			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
-		};
-
 		wlan2g {
 			label = "epg5000:blue:wlan2g";
 			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
@@ -47,7 +42,12 @@
 			linux,default-trigger = "phy0tpt";
 		};
 
-		wps {
+		wps_amber {
+			label = "epg5000:amber:wps";
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
+
+		wps_blue {
 			label = "epg5000:blue:wps";
 			gpios = <&gpio 19 GPIO_ACTIVE_LOW>;
 		};