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Add `card10.cfg` setting to disable low battery voltage check

We have identified a board where the PMIC AMUX ADC does not read proper values:

aph-amux-readout

This leads to the firmware immediately triggering a low battery condition and shutting down (to take the above measurements, we used a modified firmware which ignores low battery).

The above values all result from an ADC readout of 1. This leads us to believe the AMUX connection is severed.

As a workaround, let's introduce a new setting in card10.cfg which ignores low battery conditions (maybe also removes the power micropython module?). This is to be used with care, but allows owners of a device with such a broken AMUX to still operate it.