pinctrl: apple: remove gpio-controller check

Having this missing, but everything else valid shouldn't result
in a failure.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20211121165642.27883-9-joey.gouly@arm.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-apple-gpio.c

@@ -360,10 +360,6 @@ static int apple_gpio_register(struct apple_gpio_pinctrl *pctl)
 	void **irq_data = NULL;
 	int ret;
 
-	if (!of_property_read_bool(pctl->dev->of_node, "gpio-controller"))
-		return dev_err_probe(pctl->dev,	-ENODEV,
-				     "No gpio-controller property\n");
-
 	pctl->irq_chip = apple_gpio_irqchip;
 
 	pctl->gpio_chip.label = dev_name(pctl->dev);