[coreboot] Support to Intel CPUs

[Star Liu]

I checked the supported motherboard page, and found that support for AMD
CPUs is up to quad-core Opteron, while support for Intel CPUs is only up to
PIII. Is it because we do not have enough time to develop for Intel CPUs or
we do not like to develop for Intel CPUs? It seems that, in China, Intel
CPUs sell better than AMD, I myself have never used AMD cpu computers, so
I'm a little curious. :)