can: xilinx_can: Add ethtool stats interface for ECC errors

Add ethtool stats interface for reading FIFO 1bit/2bit ECC errors
information.

Signed-off-by: Srinivas Goud <srinivas.goud@amd.com>
Link: https://lore.kernel.org/all/20240213-xilinx_ecc-v8-3-8d75f8b80771@pengutronix.de


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>