[S] Change in coreboot[master]: commonlib/helpers.h: use unsigned literals in definitions

[Krystian Hebel (Code Review)]

Attention is currently required from: Sergii Dmytruk.

Krystian Hebel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/70106 )

Change subject: commonlib/helpers.h: use unsigned literals in definitions
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Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/70106/comment/14a4484e_d0a0da6c 
PS1, Line 21: so if result of
            : multiplication is negative
> If result of multiplying two positive integers is negative, further integer promotions don't matter  […]

Overflow reporting sounds nice, but negative frequency doesn't make sense, so I've changed it to `ULL`.