Chore better fake cpu

[sthaha]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 67.94872% with 50 lines in your changes missing coverage. Please review.

Project coverage is 90.51%. Comparing base (2d33e25) to head (448484d).
Report is 94 commits behind head on reboot.

Files with missing lines	Patch %	Lines
internal/device/fake_cpu_power_meter.go	67.94%	46 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           reboot    #2140      +/-   ##
==========================================
- Coverage   91.74%   90.51%   -1.23%     
==========================================
  Files          34       34              
  Lines        2991     3131     +140     
==========================================
+ Hits         2744     2834      +90     
- Misses        193      239      +46     
- Partials       54       58       +4     

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