Patch from Dimitry Andric <dimitry.andric@tomtom.com>

Change to using platfrom driver's .shutdown method instead
of an reboot notifier
Signed-off-by: NDimitry Andric <dimitry.andric@tomtom.com>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>