IWM_RFH_Q0_FRBDCB_RIDX
iwm_write_prph(sc, IWM_RFH_Q0_FRBDCB_RIDX, 0);
#define IWM_RFH_Q_FRBDCB_RIDX(q) (IWM_RFH_Q0_FRBDCB_RIDX + (q) * 4)