iio: amplifiers: hmc425a: use gpiod_multi_set_value_cansleep

iio: amplifiers: hmc425a: use gpiod_multi_set_value_cansleep

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

Passing NULL as the 3rd argument to gpiod_set_array_value_cansleep()
only needs to be done if the array was constructed manually, which is
not the case here. This change effectively replaces that argument with
st->gpios->array_info. The possible side effect of this change is that
it could make setting the GPIOs more efficient.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250210-gpio-set-array-helper-v3-8-d6a673674da8@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>