Bluetooth: btusb: Enable MSFT extension for Mediatek Chip (MT7921)

The Mdiatek MT7921(7961) support MSFT HCI extensions, we are using
0xFD30 for VsMsftOpCode.
Signed-off-by: mark-yw.chen <mark-yw.chen@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btusb.c

@@ -3775,6 +3775,8 @@ static int btusb_mtk_setup(struct hci_dev *hdev)
 			bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
 			return err;
 		}
+
+		hci_set_msft_opcode(hdev, 0xFD30);
 		goto done;
 	default:
 		bt_dev_err(hdev, "Unsupported hardware variant (%08x)",