memory fixup function...

Hi Martin,

I've noticed you patch already after doing some stuff and realised we're working at the same thing. I have similar approach modulo no additional fdt command, and a little more advanced /memory fixup, that takes into account #ac and #sc. Do you have updated patch? I will add my part and make sure it works on a number of fsl boards I have around.

Sincerely, Vitaly