[L] Change in coreboot[main]: soc/intel/xeon_sp: Merge SKX and CPX

[Patrick Rudolph (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Christian Walter, Johnny Lin, Jonathan Zhang, Lean Sheng Tan, Morgan Jang, Shuo Liu, Tim Chu.

Patrick Rudolph has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/85557?usp=email )

Change subject: soc/intel/xeon_sp: Merge SKX and CPX
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Patch Set 5:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/85557/comment/2806bcd2_59e0d368?usp... :
PS5, Line 10: - Create a new 14nm folder
> At a second thought, maybe we could accept both - SKX/CPX common codes in 14nm folder, while other g […]

Agree. `chip_gen1.c` should be moved to 14nm folder as those do not support UBOX as separate stack and they do not have CXL support.
For ICX/SPR a chip_gen3.c should be introduced with separate UBOX and CXL support.