iwlwifi: add led debugfs function

Adding debugfs file to show current led blinking rate
/sys/kernel/debug/ieee80211/phy0/iwlagn/data/led

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-debug.h b/drivers/net/wireless/iwlwifi/iwl-debug.h
index 1555676..e4a4dbd 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debug.h
+++ b/drivers/net/wireless/iwlwifi/iwl-debug.h
@@ -83,6 +83,9 @@
 		struct dentry *file_status;
 		struct dentry *file_interrupt;
 		struct dentry *file_qos;
+#ifdef CONFIG_IWLWIFI_LEDS
+		struct dentry *file_led;
+#endif
 	} dbgfs_data_files;
 	struct dir_rf_files {
 		struct dentry *file_disable_sensitivity;