iwlagn: support dynamic aggregation for BT coex

Use dynamic aggregation threshold if bt traffic load is high
to reduce the impact on aggregated frame.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 9fcaaf0..ea81ced 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1471,7 +1471,7 @@
 
 	/* bt coex */
 	u8 bt_status;
-	u8 bt_traffic_load, notif_bt_traffic_load;
+	u8 bt_traffic_load, last_bt_traffic_load;
 	bool bt_ch_announce;
 	bool bt_sco_active;
 	bool bt_full_concurrent;
@@ -1482,7 +1482,6 @@
 	u16 bt_on_thresh;
 	u16 bt_duration;
 	u16 dynamic_frag_thresh;
-	u16 dynamic_agg_thresh;
 	u8 bt_ci_compliance;
 	struct work_struct bt_traffic_change_work;