[S] Change in coreboot[main]: soc/intel/common/cnvi: Add CNMT Mutex

[Sean Rhodes (Code Review)]

Sean Rhodes has posted comments on this change by Sean Rhodes. ( https://review.coreboot.org/c/coreboot/+/84598?usp=email )

Change subject: soc/intel/common/cnvi: Add CNMT Mutex
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Set Ready For Review