Currently, only the WAN MAC is being populated on Habanero DVK, and that is
happening via the ethernet1 alias so U-Boot does it, previously ethernet0
was implicitly added in the SoC DTSI so it would populate the LAN MAC-s but
it was dropped(rightly so) so now LAN MAC-s and the GMAC one are random.
So, lets simply switch to using NVMEM to assign the proper MAC adresses.
Signed-off-by: Robert Marko <robimarko@gmail.com>