add nvram.sh to all startup scripts, no errors on wgt634u

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1892 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/default/etc/functions.sh

@@ -1,22 +1,8 @@
 #!/bin/ash
+. /etc/nvram.sh
 
 alias debug=${DEBUG:-:}
 
-# allow env to override nvram
-nvram () {
-  if [ -x /usr/sbin/nvram ]; then
-    case $1 in
-      get) eval "echo \${$2:-\$(command nvram get $2)}";;
-      *) command nvram $*;;
-    esac
-  else
-    case $1 in
-      get) eval "echo \${$2:-\${DEFAULT_$2}}";;
-      *);;
-    esac
-  fi  
-}
-
 # valid interface?
 if_valid () (
   ifconfig "$1" >&- 2>&- ||