ARM: dts: sunxi: Add fixed 5V regulator

Most if not all boards we've seen have a fixed 5V regulator, which is
the main power supply and/or fixed output of the PMIC.

Add this one to the common regulators DTSI.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sunxi-common-regulators.dtsi

@@ -86,4 +86,11 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	reg_vcc5v0: vcc5v0 {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
 };