[coreboot] Kconfig socket try

[Stefan Reinauer]

Myles Watson wrote:
> If we set the cpu family from the socket, then use that to control
> things like DCACHE, does that work for everyone?
>
> Signed-off-by: Myles Watson<mylesgw at gmail.com>
>   
Acked-by: Stefan Reinauer <stepan at coresystems.de>