Device model support

rio_match_device - Tell if a RIO device has a matching RIO device id structure
rio_device_probe - Tell if a RIO device structure has a matching RIO device id structure
rio_device_remove - Remove a RIO device from the system
rio_match_bus - Tell if a RIO device structure has a matching RIO driver device id structure
rio_bus_init - Register the RapidIO bus with the device model