iwlwifi: uCode statistics notification counter

Display statistics notification information
The information break down into
    uCode_tx_stats
    uCode_rx_stats
    uCode_general_stats
and can be found in /sys/kernel/debug/ieee80211/phy0/iwlagn/debug
directory

The statistic information display in debugFs is based on the last
statistics notification from uCode; it might not reflect the current
uCode activity. Using "watch" command to monitor the uCode
activity should give up-to-date statistics provided by uCode.
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>

drivers/net/wireless/iwlwifi/iwl-debug.h

@@ -100,6 +100,9 @@ struct iwl_debugfs {
 		struct dentry *file_traffic_log;
 		struct dentry *file_rx_queue;
 		struct dentry *file_tx_queue;
+		struct dentry *file_ucode_rx_stats;
+		struct dentry *file_ucode_tx_stats;
+		struct dentry *file_ucode_general_stats;
 	} dbgfs_debug_files;
 	u32 sram_offset;
 	u32 sram_len;