MODE_11NG_HT20
ch->phy_mode = MODE_11NG_HT20;
MODE_11NA_HT20 : MODE_11NG_HT20;
MODE_11NA_HT20 : MODE_11NG_HT20;
case MODE_11NG_HT20:
ch->phy_mode = MODE_11NG_HT20;
MODE_11NA_HT20 : MODE_11NG_HT20;
MODE_11NA_HT20 : MODE_11NG_HT20;
case MODE_11NG_HT20: