can: sja1000: plx_pci: Add support for Marathon CAN-bus-PCIe card

This patch adds support for the Marathon CAN-bus-PCIe card to the
sja1000 driver. For more information see:

    http://can.marathon.ru/page/devices/can-bus-pcie



Signed-off-by: Nikita Edward Baruzdin <nebaruzdin@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>