iwlwifi: mvm: BT Coex - fine tune the aggregation size

Latest tests have shown that when BT is active and has
connections but the traffic is low, the WiFi aggregation can
be large up to 4000us without noticeable impact on BT.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/bt-coex.c

@@ -921,7 +921,7 @@ u16 iwl_mvm_bt_coex_agg_time_limit(struct iwl_mvm *mvm,
 	enum iwl_bt_coex_lut_type lut_type;
 
 	if (le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) <
-	    BT_LOW_TRAFFIC)
+	    BT_HIGH_TRAFFIC)
 		return LINK_QUAL_AGG_TIME_LIMIT_DEF;
 
 	lut_type = iwl_get_coex_type(mvm, mvmsta->vif);