ath6kl: Maintain firmware interface index in struct ath6kl_vif

Pass this index to target in wmi commands to specify the interface
for which the command needs to be handled.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/init.c b/drivers/net/wireless/ath/ath6kl/init.c
index dd63408..957bfb0 100644
--- a/drivers/net/wireless/ath/ath6kl/init.c
+++ b/drivers/net/wireless/ath/ath6kl/init.c
@@ -1407,7 +1407,7 @@
 	}
 
 	/* Add an initial station interface */
-	ndev = ath6kl_interface_add(ar, "wlan%d", NL80211_IFTYPE_STATION);
+	ndev = ath6kl_interface_add(ar, "wlan%d", NL80211_IFTYPE_STATION, 0);
 	if (!ndev) {
 		ath6kl_err("Failed to instantiate a network device\n");
 		status = -ENOMEM;