gpio: wcove: use new GPIO line value setter callbacks

gpio: wcove: 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.

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20250715-gpiochip-set-rv-gpio-remaining-v2-2-072b4cf06330@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>