Build Voltage probe

[Ciusss89]

▸       /* save the rms measure of voltage and current */
▸       em->rms_c = ((rms_in_c * CT_RATIO) / bur_resistor);
▸       em->rms_v = 230; /* I don't have the voltage probe yet */
▸       (void)rms_in_v;  /* workaround to silent the -Werror=unused-but-set-variable*/

▸       return 0;

As shown before the acquisition loop is ready to compute the voltage measure.
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