mac80211: remove iwlwifi specific workaround NDPs of null_response

Remove the remaining workaround that is not removed by the
commit e41eb3e4 ("mac80211: remove iwlwifi specific workaround
that broke sta NDP tx")

Fixes: 41cbb0f5 ("mac80211: add support for HE")
Signed-off-by: NPing-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20210623134826.10318-1-pkshih@realtek.comSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

net/mac80211/sta_info.c

@@ -1398,11 +1398,6 @@ static void ieee80211_send_null_response(struct sta_info *sta, int tid,
 	struct ieee80211_tx_info *info;
 	struct ieee80211_chanctx_conf *chanctx_conf;
 
-	/* Don't send NDPs when STA is connected HE */
-	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
-	    !(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
-		return;
-
 	if (qos) {
 		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
 				 IEEE80211_STYPE_QOS_NULLFUNC |