* halconf: SERIAL_USB_BUFFERS_RX_SIZE should be 64
Until we fix bug in OTGv1
* ChibiOS: update OTGv1
* usb_console: fix SERIAL_USB_BUFFERS_TX_SIZE vs BLOCKING_FACTOR check
Actually should be removed as we can write to USB serial more than
can fit into buffer. Write caller will be just waiting for space
available in buffer.