vfs_usb_serial: set secondary selection for making usb port can output under default menu

components/vfs/include/esp_vfs_console.h

@@ -0,0 +1,24 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief add uart/usb_serial_jtag/usb_otg_acmcdc virtual filesystem driver
+ *
+ * This function is called from startup code to enable serial output
+ */
+esp_err_t esp_vfs_console_register(void);
+
+#ifdef __cplusplus
+}
+#endif