Tulip Driver Support for Multiport cards

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This makes tulip.c handle multiport cards (like the Cogent 964) work correctly with most BIOSes. I think I've seen a more sophisticated patch for this problem already on linux-kernel, but that one also didn't made it into the kernel, so I give it another try.

I think I've also found an important bug in tulip_probe(). It will only work correctly if there's only one kind of chips in your system (21040 or 21041 or 21140 or ...). This is due a wrong arrangement of the pci_index++ and cno++ loops. They should be exchanged. Can anyone confirm this behaviour? Linus, should I prepare a patch for you?