arm64: dts: meson: odroid-c2: Add missing regulator linked to P5V0 regulator

As per schematics VDDIO_AO18, VDDIO_AO3V3/VDD3V3 DDR3_1V5/DDR_VDDC:
fixed regulator output which is supplied by P5V0.

Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts

@@ -111,6 +111,36 @@ vcc3v3: regulator-vcc3v3 {
 		regulator-max-microvolt = <3300000>;
 	};
 
+	vddio_ao1v8: regulator-vddio-ao1v8 {
+		compatible = "regulator-fixed";
+		regulator-name = "VDDIO_AO1V8";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+		/* U17 RT9179GB */
+		vin-supply = <&p5v0>;
+	};
+
+	vddio_ao3v3: regulator-vddio-ao3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "VDDIO_AO3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+		/* U11 MP2161GJ-C499 */
+		vin-supply = <&p5v0>;
+	};
+
+	ddr3_1v5: regulator-ddr3_1v5 {
+		compatible = "regulator-fixed";
+		regulator-name = "DDR3_1V5";
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+		regulator-always-on;
+		/* U15 MP2161GJ-C499 */
+		vin-supply = <&p5v0>;
+	};
+
 	emmc_pwrseq: emmc-pwrseq {
 		compatible = "mmc-pwrseq-emmc";
 		reset-gpios = <&gpio BOOT_9 GPIO_ACTIVE_LOW>;