USB: ohci-platform: Move platform_data checks into the probe function

This puts all of the platform_data checks in the same place, and removes
the need for a custom drv->reset() callback.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>