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

[Shuo Liu (Code Review)]

Attention is currently required from: Arthur Heymans, Christian Walter, Johnny Lin, Jonathan Zhang, Lean Sheng Tan, Morgan Jang, Patrick Rudolph, Tim Chu.

Shuo Liu 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:

(5 comments)

Patchset:

PS5: 
May

Commit Message:

https://review.coreboot.org/c/coreboot/+/85557/comment/2aad8f8b_fe1700f7?usp... :
PS5, Line 10: - Create a new 14nm folder
There are '(xx)nm - old' and 'intel(x) - new' for process namings which is confusing. Maybe still using gen(x) as what is currently using to be consistent?

File src/soc/intel/xeon_sp/14nm/acpi/gpio.asl:

PS5: 
Should we still place the 'acpi' ahead of '14nm (or gen1)' to be consistent?

File src/soc/intel/xeon_sp/cpx/Kconfig:

https://review.coreboot.org/c/coreboot/+/85557/comment/a176eb9a_83fb016b?usp... :
PS5, Line 5: 	select SOC_INTEL_XEON_SP_14NM
Maybe we can have a SOC_INTEL_XEON_SP_GEN3 but select the same kconfigs as SOC_INTEL_XEON_SP_GEN1

File src/soc/intel/xeon_sp/skx/Kconfig:

https://review.coreboot.org/c/coreboot/+/85557/comment/0f65b4f1_87a8708a?usp... :
PS5, Line 5: 	select SOC_INTEL_XEON_SP_14NM
SOC_INTEL_XEON_SP_GEN1?