arm64: dts: mt7622: use gpio-ranges to pinctrl device

Using gpio-ranges property represent which GPIOs correspond to which pins
on MT7622 pin controllers. For details, we can see section 2.1 of
Documentation/devicetree/bindings/gpio/gpio.txt to know how to bind pinctrl
and gpio drivers via the "gpio-ranges" property.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt7622.dtsi

@@ -292,6 +292,7 @@ pio: pinctrl@10211000 {
 		reg-names = "base", "eint";
 		gpio-controller;
 		#gpio-cells = <2>;
+		gpio-ranges = <&pio 0 0 103>;
 		interrupt-controller;
 		interrupts = <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>;
 		interrupt-parent = <&gic>;