[S] Change in coreboot[master]: soc/intel/common: Add API to check Key Locker support

[Martin L Roth (Code Review)]

Attention is currently required from: Subrata Banik, Paul Menzel, Pratikkumar V Prajapati.

Martin L Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/71117 )

Change subject: soc/intel/common: Add API to check Key Locker support
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Patch Set 7:

(3 comments)

File src/soc/intel/common/block/cpu/cpulib.c:

https://review.coreboot.org/c/coreboot/+/71117/comment/515e2ff6_469c0e55 
PS7, Line 39: #define CPUID_STRUCT_EXTENDED_FEATURE_FLAGS	0x7
Use this macro?

https://review.coreboot.org/c/coreboot/+/71117/comment/d0739c3a_bc5d3f88 
PS7, Line 200: 	cpuid_regs = cpuid_ext(CPUID_STRUCT_EXTENDED_FEATURE_FLAGS, 0);
similar to here.

https://review.coreboot.org/c/coreboot/+/71117/comment/622e4808_62530c6f 
PS7, Line 542: 0x7
Could you update this to use the CPUID_STRUCT_EXTENDED_FEATURE_FLAGS definition?

Maybe do this in a follow-on patch, since the same code is used in several places above.

Maybe create an inline function to get the feature flags and use it across all of the functions?