Change in coreboot[master]: soc/intel/common/cse: Add support for sending CSE End-of-Post message

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Furquan Shaikh, Angel Pons, Subrata Banik, Sridhar Siricilla, Patrick Rudolph, Karthik Ramasubramanian.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55631 )

Change subject: soc/intel/common/cse: Add support for sending CSE End-of-Post message
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Patch Set 10:

(1 comment)

File src/soc/intel/common/block/cse/Kconfig:

https://review.coreboot.org/c/coreboot/+/55631/comment/8ada29d7_930ebbbd 
PS10, Line 74: SOC_INTEL_CSE_SET_EOP
> There is a UPD that controls when/if FSP should send the EOP message. […]

Correct, I also believe (would have to confirm) the CSE will return an error if you try to send EOP again. With this patch series, we also gain the flexibility to perform CSE Pre-boot commands any time before coreboot sends EOP instead of it being dictated by FSP.