lantiq: add missing macaddr retrieval for Netgear DGN3500

The MAC addresses were not being set for LAN and WAN. This will now use the
same MAC mechanism as the rest of the target.

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

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

@@ -116,6 +116,8 @@ DGN1000B)
 	;;
 
 DGN3500*)
+	lan_mac=$(mtd_get_mac_ascii uboot-env ethaddr)
+	wan_mac=$(macaddr_add "$lan_mac" 1)
 	ucidef_add_switch "switch0" \
 		"0:lan:4" "1:lan:3" "2:lan:2" "3:lan:1" "5t@eth0"
 	;;