Attach the miibus for Linksys/Dlink cards from the attach routine,

Attach the miibus for Linksys/Dlink cards from the attach routine,
not from the probe routine. This was an oversight when I originally
ported the miibus support to -current, though it was mostly harmless.

We now set the vendor code to the new value ED_VENDOR_LINKSYS in
ed_pccard_Linksys() at probe time. Then ed_pccard_attach() checks
the vendor code, and sets up the miibus if appropriate.

Reviewed by:	imp