Stop using OLDCARD shims. rename xe_pccard_match to xe_pccard_probe
and combine the old xe_pccard_{probe,attach} into one routine _attach.
Create a lookup function to lookup items in the table. Eliminate the
check for network cards, since many modems were eliminated by it.
Tweak a few printfs as well.

This gets many of my older cards working again CEM2, CEM28, CEM36,
etc.