gpio: ftgpio010: drop of_match_ptr for ID table

The driver can match only via the DT table so the table should be always
used and the of_match_ptr does not have any sense (this also allows ACPI
matching via PRP0001, even though it might not be relevant here).

  drivers/gpio/gpio-ftgpio010.c:336:34: error: ‘ftgpio_gpio_of_match’ defined but not used [-Werror=unused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-ftgpio010.c

@@ -349,7 +349,7 @@ static const struct of_device_id ftgpio_gpio_of_match[] = {
 static struct platform_driver ftgpio_gpio_driver = {
 	.driver = {
 		.name		= "ftgpio010-gpio",
-		.of_match_table = of_match_ptr(ftgpio_gpio_of_match),
+		.of_match_table = ftgpio_gpio_of_match,
 	},
 	.probe = ftgpio_gpio_probe,
 	.remove = ftgpio_gpio_remove,