ar71xx: add support for the WNDR3700v2 board

Based on a patch by Mark Mentovai <mark@moxienet.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25118 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/base-files/etc/uci-defaults/wndr3700

@@ -23,6 +23,6 @@ commit system
 EOF
 }
 
-if [ "${board}" == "wndr3700" ]; then
+if [ "${board}" == "wndr3700" -o "${board}" == "wndr3700v2" ]; then
 	wndr3700_set_wan_led
 fi