net: asix: revise Ethernet MAC address assignment

Revise Ethernet MAC address assignment: should now use MAC from EEPROM
if set and further handles up to two instances of custom user MACs (2nd
one with a 0x100000 offset). This way customer does not have to put
EEPROM on a secondary Ethernet on the carrier board and still gets a
valid official MAC address from us (e.g. analogous to how we did it on
our Protea carrier board).

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