This change makes it possible to use the GPIO_OPEN_DRAIN /
GPIO_OPEN_SOURCE Flags when exporting GPIOs via dts.
We need to emulate the open-source or open-drain functionalities for the
initial value, because the used functions (gpiod_direction_output_raw)
do not take this into account.
Signed-off-by: Martin Schiller <ms@dev.tdt.de>
