lantiq: fix arcadyan vg3503j switch port indexing

Both version of the vg3503j have the LAN1 labelled port connected to
switch port 4 and the LAN2 labelled port connected to switch port 2.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/lantiq/base-files/etc/board.d/02_network

@@ -191,7 +191,7 @@ arcadyan,vg3503j)
 	lan_mac=$(mtd_get_mac_ascii uboot-env ethaddr)
 	wan_mac=$(macaddr_add "$lan_mac" 1)
 	ucidef_add_switch "switch0" \
-		"2:lan:1" "4:lan:2" "6t@eth0"
+		"2:lan:2" "4:lan:1" "6t@eth0"
 	;;
 
 tplink,vr200v)