MFp4:
o Fix MFC cards. We were bogusly setting CCR_IOBASE[01] and CCR_IOLIMIT.

now when we activate the resource, we adjust these for MFC cards, per the
spec.

o Change type of pf_mfc_* to be bus_addr_t, which is more correct than

long.

This makes my 3C362D/3C363D and 3CXEM556 cards work! Woo Hoo!