[S] Change in coreboot[main]: soc/intel/xeon_sp: Add utils to find stack from device or domain

[Arthur Heymans (Code Review)]

Attention is currently required from: Christian Walter, Johnny Lin, Lean Sheng Tan, Patrick Rudolph, Shuo Liu, Tim Chu.

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81109?usp=email )

Change subject: soc/intel/xeon_sp: Add utils to find stack from device or domain
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Patch Set 3:

(1 comment)

Patchset:

PS3: 
Where is this used? I can't seem to find the CL using it. I'd like to avoid this as much as possible: i.e. parse the HOB once and then move on to using only coreboot native structure.