mux: gpio: use gpiod_multi_set_value_cansleep

Reduce verbosity by using gpiod_multi_set_value_cansleep() instead of
gpiod_set_array_value_cansleep().

Acked-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20250210-gpio-set-array-helper-v3-12-d6a673674da8@baylibre.com


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>