[coreboot-gerrit] [M] Change in coreboot[main]: commonlib: Change GCD function to always use 64 bits

[Yidi Lin (Code Review)]

Attention is currently required from: Jakub Czapiga, Julius Werner.

Yidi Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/80319?usp=email )

Change subject: commonlib: Change GCD function to always use 64 bits
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Patch Set 1: Code-Review+2