pinctrl: axp209: use new GPIO line value setter callbacks

pinctrl: axp209: use new GPIO line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/20250424-gpiochip-set-rv-pinctrl-part2-v1-2-504f91120b99@linaro.org
[Drop unnecessary curly braces]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>