Change in coreboot[master]: soc/amd/common/block/psp: Add platform secure boot support

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, ritul guru, Marshall Dawson, Paul Menzel, Angel Pons, Aamir Bohra, Fred Reitberger.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/60968 )

Change subject: soc/amd/common/block/psp: Add platform secure boot support
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Patch Set 14:

(1 comment)

File src/soc/amd/common/block/psp/Kconfig:

https://review.coreboot.org/c/coreboot/+/60968/comment/4f5bceca_6c420a07 
PS13, Line 48: 	bool "Platform secure boot enable"
> Yes, it requires BIOS image to be signed and also "Platform secure boot enable" option to be selecte […]

ran a quick test and only user-visible options can be selected via the build's .config file, so this needs to be user-visible, since the default needs to be n, but it also needs to be possible to switch this on via the .config