gpio: tegra186: don't call the set() callback directly

Drivers should not dereference GPIO chip callbacks directly. Move the
module's set() function higher to make it available to the
direction_output() callback and call it instead.

Link: https://lore.kernel.org/r/20250702-gpiochip-set-rv-gpio-round3-v1-1-0d23be74f71d@linaro.org


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