Reduce gnss battery current #6
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Problem
The GNSS battery is used to store ephemeris data for the UBLOX M8U module between sleep cycles or basically when the module is powered off. We need the battery current to be zero when we enter shipping mode and the current shutdown procedure doesn't allow that.
Solution
Add additional IO reset/power sequence to force the UBLOX M8U module into a low power state and not draw current from the battery input.