ARM: dts: rockchip: Add 3V3_SYS regulator for edgeble-neu2

Edgeble Neu2 IO board has 3V3_SYS regulator to power Audio, RS485,
and 4G Module.

Add regulator for it.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230731103518.2906147-13-jagan@edgeble.ai
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: openedev

arch/arm/boot/dts/rockchip/rv1126-edgeble-neu2-io.dts

@@ -20,6 +20,16 @@
 	chosen {
 		stdout-path = "serial2:1500000n8";
 	};
+
+	v3v3_sys: v3v3-sys-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "v3v3_sys";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
 };
 
 &gmac {