Preliminary support for Xircom Credit Card Adapter. Not to be

Preliminary support for Xircom Credit Card Adapter.  Not to be
confused with the Credit Card Adapter II and its spawn (which the xe
driver supports).  These changes get my card probing and attaching.  I
recently won one of these (and a NEC rebadged version) in an lot
auction.  The NEC didn't work, so I took it apart and found the
MB86960A chip and then modified if_fe_pccard.c to attach.  I can't
test this card further since I have no dongle for this card.