Change in coreboot[master]: soc/amd: Make espi_clear_decodes private

[Furquan Shaikh (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Felix Held.
Furquan Shaikh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52064 )

Change subject: soc/amd: Make espi_clear_decodes private
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Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/52064/comment/ec3627fb_d89b438e 
PS1, Line 10: change consolidates the clear logic into one spot.
> Right, we should guard espi_setup in bootblock.c with !VBOOT_STARTS_BEFORE_BOOTBLOCK. […]

I think the problem is what part of PSP is doing the reconfiguration of eSPI. If it is PSP BL, then yes the above check makes sense. But, if it is ABL or PSP OS, then x86 will have to redo the configuration. That is the reason I had mentioned on one of the previous CLs that PSP ideally should not touch the eSPI controller at all or at least leave it back in the state as it found at reset.