ath9k: Initialize the priority gpio for BT coex 3-wire

Oops, a stupid mistake in the original patch which adds coex 3-wire
support. Bluetooth priority gpio needs to be gpio 7.

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/btcoex.h b/drivers/net/wireless/ath/ath9k/btcoex.h
index f1baf66..297b027 100644
--- a/drivers/net/wireless/ath/ath9k/btcoex.h
+++ b/drivers/net/wireless/ath/ath9k/btcoex.h
@@ -19,6 +19,7 @@
 
 #define ATH_WLANACTIVE_GPIO	5
 #define ATH_BTACTIVE_GPIO	6
+#define ATH_BTPRIORITY_GPIO	7
 
 #define ATH_BTCOEX_DEF_BT_PERIOD  45
 #define ATH_BTCOEX_DEF_DUTY_CYCLE 55