lantiq: adds hotplug handler for handling buttons and makes w303v work with it

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@28999 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/lantiq/base-files/etc/hotplug.d/button/10-generic.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+[ "${ACTION}" = "released" ] || exit 0
+
+. /lib/functions.sh
+
+case "${BUTTON}" in
+	BTN_0)
+		logger "reset pressed"
+		sync
+		reboot
+		;;
+	BTN_1)
+		logger "factory pressed"
+		jffs2_mark_erase "rootfs_data"
+		sync
+		reboot
+		;;
+	*)
+		logger "unknown button ${BUTTON}"
+		;;
+esac