[ar71xx] add default network configuration for the TL-WR941ND board

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14654 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/base-files/etc/config/defaults/tl-wr941nd/network

+config interface loopback
+	option ifname	lo
+	option proto	static
+	option ipaddr	127.0.0.1
+	option netmask	255.0.0.0
+
+config interface eth
+	option ifname	eth0
+
+config interface lan
+	option ifname	"lan1 lan2 lan3 lan4"
+	option type	bridge
+	option proto	static
+	option ipaddr	192.168.1.1
+	option netmask	255.255.255.0
+
+config interface wan
+	option ifname	wan
+	option proto	dhcp