The GPIO buttons of ARV752DPW are active low.
Treating them as active high caused a reboot loop as a reset-button
press is detected by gpio-button-hotplug/gpio-keys-polled on startup.
This fixes: https://dev.openwrt.org/ticket/12642
Signed-off-by: Rafael Gieschke <rafael@gieschke.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36783 3c298f89-4303-0410-b956-a3cf2f4a3e73