[XL] Change in coreboot[main]: soc/intel/xeon_sp: Add Xeon ICX-SP support

[Patrick Rudolph (Code Review)]

Attention is currently required from: Christian Walter, Johnny Lin, Jonathan Zhang, Shuo Liu, Tim Chu.

Patrick Rudolph has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/85845?usp=email )

Change subject: soc/intel/xeon_sp: Add Xeon ICX-SP support
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/85845/comment/8a488332_805faa66?usp... :
PS3, Line 9: Add support for the 1st Gen 10nm Xeon-SP CPUs. Supported and tested
> ICX is 3rd gen

ICX might be advertised as 3rd gen Xeon-SP, but this term is intentionally not used as CPX is also 3rd gen Xeon-SP.

ICX 1st gen 10nm Xeon-SP
SPR 2nd gen 10nm Xeon-SP
EMR 3rd gen 10nm Xeon-SP

https://review.coreboot.org/c/coreboot/+/85845/comment/4cd00883_b4512529?usp... :
PS3, Line 10: are dual socket systems with a LBG PCH.
> So this is tested on a real ICX-SP hardware?

Yes. Mainboard support will be added as separate commit.