ath6kl: add hif_type

In some rare cases core code needs to know what hif type is used. Add
a field to struct ath6kl to denote that. Hopefully this is just a
temporary solution.
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/core.h

@@ -391,6 +391,11 @@ struct ath6kl_req_key {
 	u8 key_len;
 };
 
+enum ath6kl_hif_type {
+	ATH6KL_HIF_TYPE_SDIO,
+	ATH6KL_HIF_TYPE_USB,
+};
+
 #define MAX_NUM_VIF	1
 
 /* vif flags info */
@@ -484,6 +489,7 @@ struct ath6kl {
 	int tx_pending[ENDPOINT_MAX];
 	int total_tx_data_pend;
 	struct htc_target *htc_target;
+	enum ath6kl_hif_type hif_type;
 	void *hif_priv;
 	struct list_head vif_list;
 	/* Lock to avoid race in vif_list entries among add/del/traverse */

drivers/net/wireless/ath/ath6kl/sdio.c

@@ -1237,6 +1237,7 @@ static int ath6kl_sdio_probe(struct sdio_func *func,
 	}
 
 	ar_sdio->ar = ar;
+	ar->hif_type = ATH6KL_HIF_TYPE_SDIO;
 	ar->hif_priv = ar_sdio;
 	ar->hif_ops = &ath6kl_sdio_ops;
 	ar->bmi.max_data_size = 256;