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/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index c39693b..b6c6cca 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -3691,10 +3691,12 @@
 		btcoex_info->btactive_gpio = ATH_BTACTIVE_GPIO;
 		btcoex_info->wlanactive_gpio = ATH_WLANACTIVE_GPIO;
 
-		if (AR_SREV_9285(ah))
+		if (AR_SREV_9285(ah)) {
 			btcoex_info->btcoex_scheme = ATH_BTCOEX_CFG_3WIRE;
-		else
+			btcoex_info->btpriority_gpio = ATH_BTPRIORITY_GPIO;
+		} else {
 			btcoex_info->btcoex_scheme = ATH_BTCOEX_CFG_2WIRE;
+		}
 	} else {
 		btcoex_info->btcoex_scheme = ATH_BTCOEX_CFG_NONE;
 	}