ath9k: cleanup beacon parameters configuration

This patch configures the beacon timers with beacon interval
and beacon period passed through vif.bss_conf. Also cache the
currecnt beacon configuration which will be used to configure
the beacon timers when the driver triggers it after reset.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 3425662..bd2363f 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -600,6 +600,7 @@
 	struct ath9k_debug debug;
 #endif
 	struct ath_bus_ops *bus_ops;
+	struct ath_beacon_config cur_beacon_conf;
 };
 
 struct ath_wiphy {