At some point in the past, we read the PROM by words.  Now we read PROM by bytes.  Adjust the extraction of the MAC address from this data to reflect this change.
At some point in the past, we read the PROM by words.  Now we read
PROM by bytes.  Adjust the extraction of the MAC address from this data
to reflect this change.

This gets the AX88x90 based PC Cards MAC address working again (my
UMAX Ethernet and Linksys EC2T cards now work).

MFC After: 3 days

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