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:
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.