Change in coreboot[master]: mb/ocp/deltalake: Add VPD interface to configure CPU DEBUG

[Jonathan Zhang (Code Review)]

Attention is currently required from: Anjaneya "Reddy" Chagam, Johnny Lin, 9elements QA, Arthur Heymans, Morgan Jang.
Jonathan Zhang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49674 )

Change subject: mb/ocp/deltalake: Add VPD interface to configure CPU DEBUG
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Patch Set 2: Code-Review+1

(1 comment)

Patchset:

PS2: 
Johnny/Morgan/Rocky, to enable RAS error injection, CPU debug enabling alone is not enough. Should we define one VPD variable to toggle between RAS error injection enable/disable, or should we define multiple VPD variables, so that one variable is designated for one aspect, or should we take the approach of in-between?
Besides RAS error injection, are there any other use case that CPU debug needs to be enabled?