Change in coreboot[master]: soc/intel/xeon_sp: Enable SMI handler

[Rocky Phagura (Code Review)]

Rocky Phagura has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/46231 )

Change subject: soc/intel/xeon_sp: Enable SMI handler
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Patch Set 26:
> Patch Set 24:
> > Patch Set 24:
> >
> > (1 comment)
> >
> > Does the TCO, gnvs, and smbsus changes belong in this patch? Maybe explain in the commit message if they do.
>
> soc/intel/common has some dependencies which is what I suspect drove those changes. IDK if there is even TCO on these? GNVS is fully broken on this platform, but needs separate fixing (or actual implementing). No idea about smbus.
>
> I have some local improvements I want to push soon, like less skx/cpx boilerplate + proper IED handling. So maybe hold off on merging for a day or two?

TCO is not used, but the common block code assumes the support is there. Hence, I had to put in the ifdef's.  Regarding, smbus.h, it's required by common block SMM code also.