iwlagn: add debug for mac80211 callback

Add IWL_DEBUG_MAC80211 debug for all mac80211 callback function

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-sta.c b/drivers/net/wireless/iwlwifi/iwl-agn-sta.c
index 8e7177b..c1807fa 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-sta.c
@@ -685,6 +685,8 @@
 	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 	int sta_id;
 
+	IWL_DEBUG_MAC80211(priv, "enter\n");
+
 	switch (cmd) {
 	case STA_NOTIFY_SLEEP:
 		WARN_ON(!sta_priv->client);
@@ -704,4 +706,5 @@
 	default:
 		break;
 	}
+	IWL_DEBUG_MAC80211(priv, "leave\n");
 }