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Add Calibration offset for INA226 #81

@centydev

Description

@centydev

Is your feature request related to a problem? Please describe.
INA226 layout include 2x 10Ohm resistor that was not precision resistor, and the sense resistor has 1% tolerance. Layout is also not optimized for noise. All of this has result in more than 2% linear error for current reading.

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Describe the solution you'd like
Add Calibration offset in setting Menu. Unit in percentage.

Describe alternatives you've considered
Alternative is respin the hardware. Not favored.

Additional context
NA

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