[S] Change in coreboot[master]: soc/amd/common/psp_verstage: Copy unsigned PSP verstage binary

[Matt DeVillier (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Fred Reitberger, Karthik Ramasubramanian, Felix Held.

Matt DeVillier has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75334 )

Change subject: soc/amd/common/psp_verstage: Copy unsigned PSP verstage binary
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Patch Set 1:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/75334/comment/73db8e54_f9e2e504 
PS1, Line 10: If a signed PSP verstage binary is supplied
            : while building amdfw*.rom, then it is dropped.
this part is unclear to me. Why would we also be building the unsigned verstage if a signed binary is being supplied?

https://review.coreboot.org/c/coreboot/+/75334/comment/248f2a44_24a1661e 
PS1, Line 12: verstage binary always so that it can be used for signing directly from
            : the CI build infrastructure instead of a locally built binary.
so is the goal here simply to persist the unsigned binary so it can be signed later? If so, will the unsigned binary in amdfw be swapped with the signed binary at that time?