The Chipidea EHCI core seems to behave sanely and doesn't need
the IO watchdog. This kills off 10 non-deferrable wakeup events
per second when the controller is otherwise idle.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Tested-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NPeter Chen <peter.chen@nxp.com>