gpio: lpc32xx: fix module autoloading

Add MODULE_DEVICE_TABLE(), so the module could be properly autoloaded
based on the alias from of_device_id table.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-lpc32xx.c

@@ -529,6 +529,7 @@ static const struct of_device_id lpc32xx_gpio_of_match[] = {
 	{ .compatible = "nxp,lpc3220-gpio", },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, lpc32xx_gpio_of_match);
 
 static struct platform_driver lpc32xx_gpio_driver = {
 	.driver		= {