[coreboot] [PATCH]eliminate some noise in compareboard

[Patrick Georgi]

Hi,

attached patch eliminates some noise in the output of compareboard 
(which will show up every couple commits on this list now).
Some variables do not exist in kconfig if they're irrelevant to the 
configuration at hands.

The patch hides AMD K8/Fam10h-specific variables on non-K8/Fam10h 
boards. Currently they appear as "only in oldstyle build".
There's more to do, this is just the first step.
Once the remaining differences in configuration are done away with, 
Kconfig and newconfig should be functionally equivalent on working boards.

Signed-off-by: Patrick Georgi