lan78xx: Read MAC address from DT if present
There is a standard mechanism for locating and using a MAC address from the Device Tree. Use this facility in the lan78xx driver to support applications without programmed EEPROM or OTP. At the same time, regularise the handling of the different address sources. Signed-off-by: NPhil Elwell <phil@raspberrypi.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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