ath10k: fix WMI scan command length

Fix WMI scan command length we setup when scan request.

This fix issue with 636 firmware when scan always failed
with message:

ath10k_pci 0000:02:00.0: wmi start scan
ath10k_pci 0000:02:00.0: wmi stop scan reqid 1 req_type 0 vdev/scan_id 0
ath10k_pci 0000:02:00.0: failed to stop wmi scan: -11
ath10k_pci 0000:02:00.0: failed to stop scan: -11
ath10k_pci 0000:02:00.0: failed to start hw scan: -110

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

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

@@ -3506,10 +3506,10 @@ int ath10k_wmi_start_scan(struct ath10k *ar,
 		return ret;
 
 	if (test_bit(ATH10K_FW_FEATURE_WMI_10X, ar->fw_features))
-		len = sizeof(struct wmi_start_scan_cmd) +
+		len = sizeof(struct wmi_10x_start_scan_cmd) +
 		      ath10k_wmi_start_scan_tlvs_len(arg);
 	else
-		len = sizeof(struct wmi_10x_start_scan_cmd) +
+		len = sizeof(struct wmi_start_scan_cmd) +
 		      ath10k_wmi_start_scan_tlvs_len(arg);
 
 	skb = ath10k_wmi_alloc_skb(ar, len);