testing it to know whether we should enable the 82503 serial mode...
Move code to the right location and disallow the use of the 82503
serial mode if the sc->revision field is 0 again. This makes fxp(4)
work correctly with ATMEL 350 93C46 cards (3 port 82559 based with a
82555 PHY), as well as with the older ATMEL 220 93C46 (same flavour)
and with the even older 10Mbps-only 82557 cards with the 82503 serial
interface.
Tested by: Andre Albsmeier <andrer@albsmeier.net>, krion
MFC after: 2 weeks
93b6e2e6ff