drivers/usbdev_synopsys_dwc2: add config type for GD32V

drivers/include/usbdev_synopsys_dwc2.h

@@ -101,6 +101,11 @@ typedef struct {
                                       *  register in STM32 Reference Manual */
 #endif /* defined(MODULE_PERIPH_USBDEV_HS_UTMI) */
 #endif /* defined(MCU_STM32) || DOXYGEN */
+#if defined(MCU_GD32V)
+    uint32_t rcu_mask;              /**< bit in clock enable register */
+    uint8_t irqn;                   /**< IRQ channel */
+    uint8_t bus;                    /**< Peripheral bus */
+#endif
 } dwc2_usb_otg_fshs_config_t;
 
 #ifdef __cplusplus