[coreboot] [PATCH] model_65x CPU support

[Keith Hui]

Attached patch moves support for Deschutes Slot 1 CPUs (model_65x)
into its own home.

This is similar to the Katmai patch I submitted before, but without
microcode this time. With 17 of them they will make the patch too
large. I think I'll defer them for later or someone else*, hehe. :D

abuild-tested. I have no Deschutes CPUs to boot test this with.

Signed-off-by: Keith Hui

* also because I like to keep all microcodes for the same family
within one file instead of one microcode per file.