[PATCH] rt2x00: Remove duplicate code in MAC & BSSID handling

The various drivers contained duplicate code to handle the
MAC and BSSID initialization correctly. This moves the
address copy to little endian variables to rt2x00config.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>