[M] Change in coreboot[master]: soc/intel/xeon_sp: add MSR definition for SPR-SP

[Jonathan Zhang (Code Review)]

Attention is currently required from: TimLiu-SMCI, Johnny Lin, David Hendricks, Christian Walter, Jian-Ming Wang, Arthur Heymans, Tim Chu.

Jonathan Zhang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/72611 )

Change subject: soc/intel/xeon_sp: add MSR definition for SPR-SP
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Patch Set 1:

(1 comment)

File src/soc/intel/xeon_sp/include/soc/msr.h:

https://review.coreboot.org/c/coreboot/+/72611/comment/320c0e99_a9ca2ecf 
PS1, Line 44: #if (CONFIG(SOC_INTEL_SAPPHIRERAPIDS_SP))
> Agreed. […]

skx/cpx/spr have different include path for <skx|cpx|spr>/include/soc.Therefore, we could have files with same file name (soc_msr.h) in those directories. And then mer.h just need to have one line:
#include <soc/soc_msr.h>
and the rest of the definitions are common for all xeon_sp socs.