boards: sam_e70_xplained: default enable EEPROM source for MAC address

The SAME70-XPLD board comes with an EEPROM that holds the MAC address
to be used with its Ethernet interface.  Enable that feature by
default, so the application doesn't have to.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
1 file changed