Change in coreboot[master]: mb/google/guybrush: Enable PSP_POSTCODES_ON_ESPI config

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Raul Rangel, Rob Barnes.
Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62881 )

Change subject: mb/google/guybrush: Enable PSP_POSTCODES_ON_ESPI config
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Patch Set 1:

(1 comment)

Patchset:

PS1: 
I am abandonding this CL since PSP uses ESPI by default to write postcodes. Hence it is enabled at the SoC Kconfig.