[M] Change in coreboot[main]: soc/intel/xeon_sp: Attach more stacks

[Felix Held (Code Review)]

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

Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/80091?usp=email )

Change subject: soc/intel/xeon_sp: Attach more stacks
......................................................................

Patch Set 6:

(1 comment)

Patchset:

PS6: 
would probably be good to rebase this one on top of CB:78330 since there will be a merge conflict between those two and i'd like to prioritize getting CB:78330 into upstream