ath6kl: make maximum number of vifs runtime configurable

Needed when detecting how many vifs firmware supports.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/txrx.c b/drivers/net/wireless/ath/ath6kl/txrx.c
index 0b45d45..506a303 100644
--- a/drivers/net/wireless/ath/ath6kl/txrx.c
+++ b/drivers/net/wireless/ath/ath6kl/txrx.c
@@ -541,7 +541,7 @@
 	int status;
 	enum htc_endpoint_id eid;
 	bool wake_event = false;
-	bool flushing[MAX_NUM_VIF] = {false};
+	bool flushing[ATH6KL_VIF_MAX] = {false};
 	u8 if_idx;
 	struct ath6kl_vif *vif;