Convert driver to use watchdog infrastructure. This includes
infrastructure support to handle watchdog keepalive if the watchdog
is running while the watchdog device is closed.
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Tested-by: NDouglas Anderson <dianders@chromium.org>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>