pinctrl: amlogic-a4: use new GPIO line value setter callbacks

pinctrl: amlogic-a4: 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: Xianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/20250408-gpiochip-set-rv-pinctrl-part1-v1-6-c9d521d7c8c7@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>