usb: USB Host stack uses USB PHY driver

This commit updates the USB Host stack to use the USB PHY driver. The
USB PHY and the OTG Controller should now both be setup/deleted using
usb_new_phy() and usb_del_phy() respectively.

- The hcd_install() now expects the USB PHY and OTG Contorller to be
    already setup before it is called
- usb_host_install() now has an option to skip calling usb_del_phy() if
    the user wants to setup their own USB PHY (e.g., in the case of using
    and external PHY).
- CDC-ACM and MSC examples/test updated to use internal PHY

Closes https://github.com/espressif/esp-idf/issues/8061

components/usb/private_include/usbh.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -88,6 +88,8 @@ typedef struct {
  * - This function will internally install the HCD
  * - This must be called before calling any Hub driver functions
  *
+ * @note Before calling this function, the Host Controller must already be un-clock gated and reset. The USB PHY
+ *       (internal or external, and associated GPIOs) must already be configured.
  * @param usbh_config USBH driver configuration
  * @return esp_err_t
  */
@@ -99,6 +101,8 @@ esp_err_t usbh_install(const usbh_config_t *usbh_config);
  * - This function will uninstall the HCD
  * - The Hub driver must be uninstalled before calling this function
  *
+ * @note This function will simply free the resources used by the USBH. The underlying Host Controller and USB PHY will
+ *       not be disabled.
  * @return esp_err_t
  */
 esp_err_t usbh_uninstall(void);