iwlwifi: Add debugfs to iwl core

This patch adds debugfs support to iwl core
currently only iwl4965 is supported

Signed-off-by: Tomas Winkler <tomas.winkler@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-4965.h b/drivers/net/wireless/iwlwifi/iwl-4965.h
index aded601..cec62ba 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.h
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.h
@@ -1212,7 +1212,11 @@
 	/* debugging info */
 	u32 framecnt_to_us;
 	atomic_t restrict_refcnt;
-#endif
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+	/* debugfs */
+	struct iwl_debugfs *dbgfs;
+#endif /* CONFIG_IWLWIFI_DEBUGFS */
+#endif /* CONFIG_IWLWIFI_DEBUG */
 
 	struct work_struct txpower_work;
 #ifdef CONFIG_IWL4965_SENSITIVITY