net: can: Introduce MEN 16Z192-00 CAN controller driver

This CAN Controller is found on MEN Chameleon FPGAs.

The driver/device supports the CAN2.0 specification.
There are 255 RX and 255 Tx buffer within the IP. The
pointer for the buffer are handled by HW to make the
access from within the driver as simple as possible.

The driver also supports parameters to configure the
buffer level interrupt for RX/TX as well as a RX timeout
interrupt.

With this configuration options, the driver/device
provides flexibility for different types of usecases.

Signed-off-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>