ath10k: enable 10.x firmware branch support

Since the WMI API has been added and we can detect from the
FW IEs what firmware variant we deal with, turn on support
for 10.x firmware branch in ath10k_wmi_attach().

kvalo: improve the commit log

Signed-off-by: Bartosz Markowski <bartosz.markowski@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath10k/wmi.c

@@ -1970,26 +1970,21 @@ static void ath10k_wmi_process_rx(struct ath10k *ar, struct sk_buff *skb)
 /* WMI Initialization functions */
 int ath10k_wmi_attach(struct ath10k *ar)
 {
-	int ret;
-
 	if (test_bit(ATH10K_FW_FEATURE_WMI_10X, ar->fw_features)) {
-		ath10k_warn("Firmware 10.X is not yet supported\n");
 		ar->wmi.cmd = &wmi_10x_cmd_map;
 		ar->wmi.vdev_param = &wmi_10x_vdev_param_map;
 		ar->wmi.pdev_param = &wmi_10x_pdev_param_map;
-		ret = -ENOTSUPP;
 	} else {
 		ar->wmi.cmd = &wmi_cmd_map;
 		ar->wmi.vdev_param = &wmi_vdev_param_map;
 		ar->wmi.pdev_param = &wmi_pdev_param_map;
-		ret = 0;
 	}
 
 	init_completion(&ar->wmi.service_ready);
 	init_completion(&ar->wmi.unified_ready);
 	init_waitqueue_head(&ar->wmi.tx_credits_wq);
 
-	return ret;
+	return 0;
 }
 
 void ath10k_wmi_detach(struct ath10k *ar)