pinctrl: mediatek: moore: implement gpio_chip::get_direction()

pinctrl: mediatek: moore: implement gpio_chip::get_direction()

If the gpio_chip::get_direction() callback is not implemented by the GPIO
controller driver, GPIOLIB emits a warning.

Implement get_direction() for the GPIO part of pinctrl-moore.

Fixes: 471e998c0e31 ("gpiolib: remove redundant callback check")
Fixes: e623c4303ed1 ("gpiolib: sanitize the return value of gpio_chip::get_direction()")
Reported-by: Frank Wunderlich <frank-w@public-files.de>
Closes: https://lore.kernel.org/all/20260409132724.126258-1-linux@fw-web.de/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Tested-By: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Linus Walleij <linusw@kernel.org>