There are several instances where we use a separate property to
override polarity specified in gpio property. Factor it out into
a separate function.
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NBartosz Golaszewski <bartosz.golaszewski@linaro.org>