[coreboot-gerrit] Change in coreboot[master]: soc/intel/cannonlake: Add IccMax limitation for CML U22

[Jamie Chen (Code Review)]

Jamie Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37189 )

Change subject: soc/intel/cannonlake: Add IccMax limitation for CML U22
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Patch Set 2:
> Patch Set 2:
>
> Open question:
> Can we leverage SKL/KBL work of get_sku_icc_max()?

get_sku_icc_max() on SKY/KBL is do the same thing like the CML FSP (See Fsp mCpuVrOverrideTable at CometLakeSiliconPkg/Cpu/Library/Private/PeiCpuInitLib/CpuInitPreResetCpl.c).

I want to add a limitation for U22 CPU because no matter go through FSP VR override table or device tree, both have wrong IccMax[IA_CORE] configure.

Use FSP VR override table, IccMax[U42,U62] = 85A and IccMax[U22] = 35A ,but 85A is over the hatch VR design. Hatch is using 70A VR design.
    
Use device tree configure, IccMax[U22,U42,U62] = 70A, IccMax[U22] is over the EDS define 35A.

But it is a good reference code, I will use the same variable name at my next patchset.