Change in coreboot[master]: soc/amd: Do SMM relocation via MSR

[Arthur Heymans (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Paul Menzel, Kyösti Mälkki, Fred Reitberger, Felix Held.
Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/64498 )

Change subject: soc/amd: Do SMM relocation via MSR
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Patch Set 3:

(1 comment)

File src/soc/amd/common/Kconfig.common:

https://review.coreboot.org/c/coreboot/+/64498/comment/1a2094b8_b96e739b 
PS1, Line 9: X86_SMM_NO_RELOCATION_HANDLER
> > i preferred the version with the negative logic. the default there was is n and the socs wanting to use this feature can just select the option which i find more intuitive. now it's the unexpected way around
>
> I'm planning to create common code for AMD mp init and they will all use the MSR feature so it's basically intel vs amd. Whether to use a relocation handler then just becomes an historical artifact and it does not matter what the default is as it is set in all cases.

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