ramips: mt7621: Ubiquiti ER-X: fix gpio number for POE enable gpio

With v5.4 kernel a new gpio driver is used.
GPIO numbering has changed so update 03_gpio_switches too.
Signed-off-by: René van Dorst <opensource@vdorst.com>

target/linux/ramips/mt7621/base-files/etc/board.d/03_gpio_switches

@@ -14,7 +14,7 @@ telco-electronics,x1)
 	ucidef_add_gpio_switch "modem_reset" "Modem Reset" "16"
 	;;
 ubnt,edgerouter-x)
-	ucidef_add_gpio_switch "poe_passthrough" "PoE Passthrough" "0"
+	ucidef_add_gpio_switch "poe_passthrough" "PoE Passthrough" "480"
 	;;
 ubnt,edgerouter-x-sfp)
 	ucidef_add_gpio_switch "poe_power_port0" "PoE Power Port0" "496"