arcnet: com20020-pci: set dev_port to the subdevice index
arcnet: com20020-pci: set dev_port to the subdevice index

This patch sets the dev_port according to the index of
the card. This can be used by udev to name the ports
in userspace.

Signed-off-by: Michael Grzeschik <56a917ffddddef251f53499c2bdc20635fcae7f7@pengutronix.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs