can: usb: esd_usb2: Add support for CAN-USB/Micro

This patch extends the esd_usb2 driver to support the
tiny CAN-USB/Micro CAN/USB interface.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>