Remove rssadapt(9) bits;  Firmware supports rate adaption.  Also, remove unused arguments in the TX descriptor setup routine.
Remove rssadapt(9) bits;  Firmware supports rate adaption.  Also,
remove unused arguments in the TX descriptor setup routine.

ok claudio@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars