gpio: implement gpio-ranges binding document fix

Use the new of_parse_phandle_with_fixed_args() to implement the
corrected gpio-ranges DT property definition.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -194,8 +194,8 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip)
 		return;
 
 	for (;; index++) {
-		ret = of_parse_phandle_with_args(np, "gpio-ranges",
-				"#gpio-range-cells", index, &pinspec);
+		ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
+				index, &pinspec);
 		if (ret)
 			break;