ARM: sun7i: Add the PIO controller node to the DTSI

The PIO controller is responsible for the GPIO/muxing/external
interrupts handling. Now that we have support for the A20 pin set in the
pinctrl driver, we can start using it in the DTSI.
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -61,6 +61,18 @@
 		#size-cells = <1>;
 		ranges;
 
+		pio: pinctrl@01c20800 {
+			compatible = "allwinner,sun7i-a20-pinctrl";
+			reg = <0x01c20800 0x400>;
+			interrupts = <0 28 1>;
+			clocks = <&osc24M>;
+			gpio-controller;
+			interrupt-controller;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#gpio-cells = <3>;
+		};
+
 		timer@01c20c00 {
 			compatible = "allwinner,sun4i-timer";
 			reg = <0x01c20c00 0x90>;