iwlagn: advertise reliable TX status

Our hardware has reliable TX status, but we're
not currently advertising that to mac80211.
Since the packet loss monitoring will depend
on it, advertise it.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NWey-Yi Guy <wey-yi.w.guy@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -3175,7 +3175,8 @@ static int iwl_mac_setup_register(struct iwl_priv *priv,
 	hw->flags = IEEE80211_HW_SIGNAL_DBM |
 		    IEEE80211_HW_AMPDU_AGGREGATION |
 		    IEEE80211_HW_NEED_DTIM_PERIOD |
-		    IEEE80211_HW_SPECTRUM_MGMT;
+		    IEEE80211_HW_SPECTRUM_MGMT |
+		    IEEE80211_HW_REPORTS_TX_ACK_STATUS;
 
 	if (!priv->cfg->base_params->broken_powersave)
 		hw->flags |= IEEE80211_HW_SUPPORTS_PS |