iwlwifi: rename wait_for_tx_queues_empty

Rename current wait_tx_queue_empty to wait_tx_queues_empty since
it waits for multiple queues (up to 32).
Next patch will add a wait for single TX queue which is needed for
gen2 to be scalable for 512.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/dvm/lib.c

@@ -180,7 +180,7 @@ void iwlagn_dev_txfifo_flush(struct iwl_priv *priv)
 		goto done;
 	}
 	IWL_DEBUG_INFO(priv, "wait transmit/flush all frames\n");
-	iwl_trans_wait_tx_queue_empty(priv->trans, 0xffffffff);
+	iwl_trans_wait_tx_queues_empty(priv->trans, 0xffffffff);
 done:
 	ieee80211_wake_queues(priv->hw);
 	mutex_unlock(&priv->mutex);

drivers/net/wireless/intel/iwlwifi/dvm/mac80211.c

@@ -1143,7 +1143,7 @@ static void iwlagn_mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	}
 
 	IWL_DEBUG_TX_QUEUES(priv, "wait transmit/flush all frames\n");
-	iwl_trans_wait_tx_queue_empty(priv->trans, scd_queues);
+	iwl_trans_wait_tx_queues_empty(priv->trans, scd_queues);
 done:
 	mutex_unlock(&priv->mutex);
 	IWL_DEBUG_MAC80211(priv, "leave\n");