ARM: dts: imx7-mba7: Add missing vcc supply to i2c devices

Fixes the warnings:
pca953x 1-0020: supply vcc not found, using dummy regulator
lm75 0-0049: supply vs not found, using dummy regulator
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi

@@ -182,6 +182,14 @@ reg_audio_3v3: regulator-audio-3v3 {
 		regulator-always-on;
 	};
 
+	reg_vcc_3v3: regulator-vcc-3v3 {
+		compatible = "regulator-fixed";
+		regulator-name = "VCC3V3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
+
 	sound {
 		compatible = "fsl,imx-audio-tlv320aic32x4";
 		model = "imx-audio-tlv320aic32x4";
@@ -304,6 +312,7 @@ &i2c1 {
 	lm75: temperature-sensor@49 {
 		compatible = "national,lm75";
 		reg = <0x49>;
+		vs-supply = <&reg_vcc_3v3>;
 	};
 };
 
@@ -336,6 +345,7 @@ pca9555: gpio-expander@20 {
 		interrupts = <12 IRQ_TYPE_EDGE_FALLING>;
 		interrupt-controller;
 		#interrupt-cells = <2>;
+		vcc-supply = <&reg_vcc_3v3>;
 	};
 };