ARM: dts: sun4i: inet97fv2: Disable unused usb controllers

The inet97fv2 tablet only has a usb-2 wifi device connected to the second
ehci controller, disable the first ehci controller and both ohci
controllers.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>