[S] Change in coreboot[master]: common/block/cse: Add config to split CSE firmware sync

[Subrata Banik (Code Review)]

Attention is currently required from: Krishna P Bhat D, Rizwan Qureshi, Sridhar Siricilla.

Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75514?usp=email )

Change subject: common/block/cse: Add config to split CSE firmware sync
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Patch Set 2:

(1 comment)

Patchset:

PS2: 
overall we need to agree on a few things

1. traditionally, CSE sync is the way to perform two operations
   a. switch from CSE RO to CSE RW 
   b. Allow CSE fw upgrade or downgrade if required

with the modified proposal, we are keeping the 1a. early in romstage (which we can't call it anymore CSE sync).

1b. is flexible either romstage or ramstage. maybe for PSR enabled platform, it will be in ramstage. the RPL-R or ADL devices, it still is performing the 1b. inside romstage.

hence, i would suggest to have three config to clarify the job description and call out the dependency in proper.