ath79: fix USB port LED assignment for ZyXEL NBG6716

The USB LED assignment to internal ports was swapped.

Fix it.

We also explicitly checked that the LED label numbers match those
on the device.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/dts/qca9558_zyxel_nbg6716.dts

@@ -38,14 +38,14 @@
 			label = "nbg6716:white:usb1";
 			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
 			linux,default-trigger = "usbport";
-			trigger-sources = <&hub_port0>;
+			trigger-sources = <&hub_port1>;
 		};
 
 		usb2 {
 			label = "nbg6716:white:usb2";
 			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
 			linux,default-trigger = "usbport";
-			trigger-sources = <&hub_port1>;
+			trigger-sources = <&hub_port0>;
 		};
 
 		wifi2 {