rt2x00: Add USB ID for CEIVA adapter to rt73usb

This adds support for CEIVA USB wireless adapters to the rt73usb driver.

Signed-off-by: Bryan Polk <sainth@eidolons.org>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>