gpiolib: Fix gpio_direction_* for single direction GPIOs
GPIOs with no programmable direction are not required to implement direction_output nor direction_input. If we try to set an output direction on an output-only GPIO or input direction on an input-only GPIO simply return 0. This allows this single direction GPIO to be used by libgpiod. Signed-off-by: NRicardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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