fix cpu warnings

[olpipi]

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[EgorDuplensky]

@olpipi I believe this fixes -Wconversion warnings. Is this change really required?
We have clang-tidy check bugprone-narrowing-conversions which does exactly the same thing but allows to ignore some of the useless conversion warnings which are usually just kind of suppressed with static_casts.
Those static_cast bring no value besides making the code less readable in this particular case. The real fix is to have strict requirements regarding integer math, i.e. to only use int64_t or something to cover both int and size_t. But this requires much more changes.

[EgorDuplensky]

The intent is to avoid such change if possible.
We can suppress -Wconversion warning for the cpu plugin completely because this is covered by clang-tidy