ppc40x: add sysupgrade support (backport of r20821)

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@20825 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ppc40x/base-files/lib/ppc40x.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# Copyright (C) 2010 OpenWrt.org
+#
+
+ppc40x_board_name() {
+	local model
+
+	model=$(awk 'BEGIN{FS="[ \t]+:[ \t]"} /model/ {print $2}' /proc/cpuinfo)
+	echo $model
+}