atusb/fw/include/at86rf230.h: started updates for AT86RF231
atusb/fw/include/at86rf230.h: started updates for AT86RF231

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan