[M] Change in coreboot[master]: src: Implement framework for PRERAM VSD store

[Subrata Banik (Code Review)]

Attention is currently required from: Arthur Heymans, Dinesh Gehlot, Julius Werner, Kapil Porwal, Lean Sheng Tan, Werner Zeh.

Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/76393?usp=email )

Change subject: src: Implement framework for PRERAM VSD store
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Patch Set 12:

(1 comment)

Patchset:

PS12: 
Thinking load here, do we really need cbmem_vsd_find() API?

we can always use cbmem_find(cbmem_id) to get the VSD data from cbmem region.

Even for cbmem_vsd_add() API, if we can add the minimal code inside existing cbmem_add() API to support VSD data structure, we cab eventually drop those two new APIs. Just the CBMEM_ID is enough to add/find the VSD region.

This might also help to address the comment from Julius.