arm64: dts: imx8mn-var-som: add fixed 3.3V regulator for EEPROM

When the EEPROM is probed, we have this warning:

    at24 0-0052: supply vcc not found, using dummy regulator

Add fixed 3.3v regulator to silence the warning.
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi

@@ -31,6 +31,14 @@ reg_eth_phy: regulator-eth-phy {
 		gpio = <&gpio2 9 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 	};
+
+	reg_3v3_fixed: regulator-3v3-fixed {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed_3v3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
 };
 
 &A53_0 {
@@ -234,6 +242,7 @@ eeprom_som: eeprom@52 {
 		compatible = "atmel,24c04";
 		reg = <0x52>;
 		pagesize = <16>;
+		vcc-supply = <&reg_3v3_fixed>;
 	};
 };