add parse config descriptor to example

move usbh_edpt_open() to public API, remove rhport from its signature

src/host/usbh_classdriver.h

@@ -63,9 +63,6 @@ void usbh_int_set(bool enabled);
 // USBH Endpoint API
 //--------------------------------------------------------------------+
 
-// Open an endpoint
-bool usbh_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep);
-
 // Submit a usb transfer with callback support, require CFG_TUH_API_EDPT_XFER
 bool usbh_edpt_xfer_with_callback(uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes,
                                   tuh_xfer_cb_t complete_cb, uintptr_t user_data);