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/hcd.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
  */
@@ -180,9 +180,10 @@ typedef struct {
  * @brief Installs the Host Controller Driver
  *
  * - Allocates memory and interrupt resources for the HCD and underlying ports
- * - Setups up HCD to use internal PHY
  *
  * @note This function must be called before any other HCD function is called
+ * @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 config HCD configuration
  * @retval ESP_OK: HCD successfully installed
@@ -199,6 +200,9 @@ esp_err_t hcd_install(const hcd_config_t *config);
  * Before uninstalling the HCD, the following conditions should be met:
  * - All ports must be uninitialized, all pipes freed
  *
+ * @note This function will simply free the resources used by the HCD. The underlying Host Controller and USB PHY will
+ *       not be disabled.
+ *
  * @retval ESP_OK: HCD successfully uninstalled
  * @retval ESP_ERR_INVALID_STATE: HCD is not in the right condition to be uninstalled
  */