gpio: altera-a10sr: Set gpio_chip parent property

Set the gpio_chip parent property since some recent functions
such as devprop_gpiochip_set_names() can use it.
Signed-off-by: NThor Thayer <thor.thayer@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-altera-a10sr.c

@@ -96,7 +96,7 @@ static int altr_a10sr_gpio_probe(struct platform_device *pdev)
 	gpio->regmap = a10sr->regmap;
 
 	gpio->gp = altr_a10sr_gc;
-
+	gpio->gp.parent = pdev->dev.parent;
 	gpio->gp.of_node = pdev->dev.of_node;
 
 	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);