[coreboot] buildrom error with M2V-MX SE

[Myles Watson]

> > The issue is that we don't have "targets" anymore. buildrom probably
> > needs some update for the coreboot build method.
> >
> 
> Yes, buildrom is very much out of date and kconfig does a lot of what
> buildrom was doing. It may be time to drop buildrom.

I think buildrom is still useful for building payloads.  I agree that it
doesn't help much with coreboot any more.

Thanks,
Myles