sensor: bq274xx: Add power management and shutdown mode

Add support for power management and the shutdown mode for bq274xx fuel
gauge sensor. This now allows boards that have any kind of low power
mode to turn on or off the sensor.

Tested on a Company's custom board with bq27421 sensor on it.

Signed-off-by: Luka Lopotar <luka.lopotar@greyp.com>
3 files changed