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: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 5b96b0d..50cee2b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3175,7 +3175,8 @@
 	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 |