ath9k: Add an option for station statistics

Also, rename node_stat to node_aggr.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index d0c3aec..07fcf16 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -2111,7 +2111,7 @@
 	.get_et_strings     = ath9k_get_et_strings,
 #endif
 
-#if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_ATH9K_DEBUGFS)
+#if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_ATH9K_STATION_STATISTICS)
 	.sta_add_debugfs    = ath9k_sta_add_debugfs,
 #endif
 	.sw_scan_start	    = ath9k_sw_scan_start,