iwlwifi: Traffic type and counter for debugFs

Break down the traffic type and counter for both Tx and Rx.
Enhance the tx_statistics and rx_statistics debugfs function and move
to /sys/kernel/debug/ieee80211/phy0/iwlagn/debug directory to help
better debugging both driver and uCode related problems.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-led.c b/drivers/net/wireless/iwlwifi/iwl-led.c
index 3d61cb4..f420c99 100644
--- a/drivers/net/wireless/iwlwifi/iwl-led.c
+++ b/drivers/net/wireless/iwlwifi/iwl-led.c
@@ -272,7 +272,8 @@
 	/* count both tx and rx traffic to be able to
 	 * handle traffic in either direction
 	 */
-	u64 current_tpt = priv->tx_stats[2].bytes + priv->rx_stats[2].bytes;
+	u64 current_tpt = priv->tx_stats.data_bytes +
+			  priv->rx_stats.data_bytes;
 	s64 tpt = current_tpt - priv->led_tpt;
 
 	if (tpt < 0) /* wraparound */