gpio: rcar: 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-rcar.c:435:34: error: ‘gpio_rcar_of_table’ 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-rcar.c

@@ -663,7 +663,7 @@ static struct platform_driver gpio_rcar_device_driver = {
 	.driver		= {
 		.name	= "gpio_rcar",
 		.pm     = &gpio_rcar_pm_ops,
-		.of_match_table = of_match_ptr(gpio_rcar_of_table),
+		.of_match_table = gpio_rcar_of_table,
 	}
 };