add a default and suitable network config file

SVN-Revision: 32939

target/linux/mcs814x/base-files/etc/config/network

+# Copyright (C) 2012 OpenWrt.org
+
+config interface loopback
+	option ifname	lo
+	option proto	static
+	option ipaddr	127.0.0.1
+	option netmask	255.0.0.0
+
+config interface lan
+	option ifname	eth0
+	option proto	static
+	option ipaddr	192.168.1.1