add class driver deinit

src/class/vendor/vendor_device.h

@@ -139,6 +139,7 @@ static inline uint32_t tud_vendor_write_available (void)
 // Internal Class Driver API
 //--------------------------------------------------------------------+
 void     vendord_init(void);
+bool     vendord_deinit(void);
 void     vendord_reset(uint8_t rhport);
 uint16_t vendord_open(uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
 bool     vendord_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes);