iwx_rs_vht_rates
uint16_t iwx_rs_vht_rates(struct iwx_softc *, struct ieee80211_node *, int);
htole16(iwx_rs_vht_rates(sc, ni, 1));
htole16(iwx_rs_vht_rates(sc, ni, 2));
htole16(iwx_rs_vht_rates(sc, ni, 1));
htole16(iwx_rs_vht_rates(sc, ni, 2));