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Fixes Boron charging current limitation when powered by VUSB #1846
Customers are limited to 500mA charging current when Boron is powered by VUSB.
Affected Device: Gen3 devices
When Boron is powered by VUSB pin, the power supply is blocked by the diode. For nRF52840,
Since the USB peripheral is left to an uncontrolled state, PMIC would wrongly assume the board is connected to a USB host.
When the PMIC driver detects the USB host connection, it will also check whether USB is really connected. If not, it will increase charging current.
Steps to Test