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/include/usb/usb_host.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
  */
@@ -91,7 +91,11 @@ typedef void (*usb_host_client_event_cb_t)(const usb_host_client_event_msg_t *ev
  * Configuration structure of the USB Host Library. Provided in the usb_host_install() function
  */
 typedef struct {
-    int intr_flags;                     /**< Interrupt flags for the underlying ISR used by the USB Host stack */
+    bool skip_phy_setup;        /**< If set, the USB Host Library will not configure the USB PHY thus allowing the user
+                                     to manually configure the USB PHY before calling usb_host_install(). Users should
+                                     set this if they want to use an external USB PHY. Otherwise, the USB Host Library
+                                     will automatically configure the internal USB PHY */
+    int intr_flags;             /**< Interrupt flags for the underlying ISR used by the USB Host stack */
 } usb_host_config_t;
 
 /**
@@ -118,6 +122,9 @@ typedef struct {
  * - This function should only once to install the USB Host Library
  * - This function should be called before any other USB Host Library functions are called
  *
+ * @note If skip_phy_setup is set in the install configuration, the user is responsible for ensuring that the underlying
+ *       Host Controller is enabled and the USB PHY (internal or external) is already setup before this function is
+ *       called.
  * @param[in] config USB Host Library configuration
  * @return esp_err_t
  */
@@ -131,6 +138,8 @@ esp_err_t usb_host_install(const usb_host_config_t *config);
  * - All devices must have been freed by calling usb_host_device_free_all() and receiving the
  *   USB_HOST_LIB_EVENT_FLAGS_ALL_FREE event flag
  *
+ * @note If skip_phy_setup was set when the Host Library was installed, the user is responsible for diasbling the
+ *       underlying Host Controller and USB PHY (internal or external).
  * @return esp_err_t
  */
 esp_err_t usb_host_uninstall(void);