[S] Change in coreboot[main]: soc/intel/xeon_sp/skx: Fix CPU init

[Patrick Rudolph (Code Review)]

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

Patrick Rudolph has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/85289?usp=email )

Change subject: soc/intel/xeon_sp/skx: Fix CPU init
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Patch Set 4:

(1 comment)

File src/soc/intel/xeon_sp/skx/cpu.c:

https://review.coreboot.org/c/coreboot/+/85289/comment/a1c473c8_327e9622?usp... :
PS4, Line 123: 	msr.hi |= BIT20;
> Do we know what this does?

It's not officially documented. Looking at haswell:
`Enable decay mode on C-state entry.`
;-)