gpiolib: Use fwnode instead of device in gpiochip_get_ngpios()

gpiolib: Use fwnode instead of device in gpiochip_get_ngpios()

The gpiochip_get_ngpios() can be used in the cases where passed device
is not a provider of the certain property. Use fwnode instead.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Reviewed-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Link: https://lore.kernel.org/r/20250213195621.3133406-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>