mac80211: don't duplicate station QoS capability data

We currently track the QoS capability twice: for all peer stations
in the WLAN_STA_WME flag, and for any clients associated to an AP
interface separately for drivers in the sta->sta.wme field.

Remove the WLAN_STA_WME flag and track the capability only in the
driver-visible field, getting rid of the limitation that the field
is only valid in AP mode.

Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/tdls.c

@@ -316,8 +316,7 @@ ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata,
 	}
 
 	/* add the QoS param IE if both the peer and we support it */
-	if (local->hw.queues >= IEEE80211_NUM_ACS &&
-	    test_sta_flag(sta, WLAN_STA_WME))
+	if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme)
 		ieee80211_tdls_add_wmm_param_ie(sdata, skb);
 
 	/* add any custom IEs that go before HT operation */