ch32v3 fs: signal bus speed

[JannisKonradBecker]

Describe the PR
dcd_int_handler in dcd_ch32_usbfs.c signals reset with unset speed which leads to a hardfault if tud_task_ext trys to log in

TU_LOG_USBD(": %s Speed\r\n", tu_str_speed[event.bus_reset.speed]);

[HiFiPhile]

Thank you, please use speed enum instead of 0 or 1.

tinyusb/src/common/tusb_types.h

Line 92 in eca025f

} tusb_speed_t;

[hathach]

look good, thank you