ath79: tplink-archer-c6-v2-us: fix inverted LED colors

The amber and green wan led color was inverted in dts file, which ends
up leaving the wan led amber when the connection is established, so,
switch gpio led number (7 and 8) in qca9563_tplink_archer-c6-v2-us.dts.

Tip: the /etc/config/system file needs to be regenerated.

Signed-off-by: Rodrigo B. de Sousa Martins <rodrigo.sousa.577@gmail.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz> [commit subject]

target/linux/ath79/dts/qca9563_tplink_archer-c6-v2-us.dts

@@ -43,12 +43,12 @@
 
 		wan {
 			label = "green:wan";
-			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
 		};
 
 		wan_fail {
 			label = "amber:wan";
-			gpios = <&gpio 7 GPIO_ACTIVE_LOW>;
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
 		};
 
 		wps {