[S] Change in coreboot[main]: soc/amd: add PSP SMI handler stub

[Nico Huber (Code Review)]

Attention is currently required from: Felix Held, Fred Reitberger, Jason Glenesk, Martin L Roth, Matt DeVillier, Varshit Pandya, ritul guru.

Nico Huber has posted comments on this change by Felix Held. ( https://review.coreboot.org/c/coreboot/+/83739?usp=email )

Change subject: soc/amd: add PSP SMI handler stub
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Patch Set 3: Code-Review+2

(2 comments)

File src/soc/amd/cezanne/smihandler.c:

https://review.coreboot.org/c/coreboot/+/83739/comment/48943fa0_f218cbab?usp... :
PS2, Line 116: psp_smi_handler
> oh, looks like i missed the 'in the header part' when reading your comment. […]

:)

File src/soc/amd/common/block/psp/psp_smm.c:

https://review.coreboot.org/c/coreboot/+/83739/comment/851fbbfe_999426e0?usp... :
PS2, Line 94: 		configure_psp_smi();
> it's not necessary to do this in smm; however the next patch CB:83740 adds the enable_psp_smi call w […]

Ack. Just checking that this wasn't a mistake.