ARM: dts: stm32: add missing vdda-supply to adc on stm32h743i-eval

Add missing vdda-supply required by STM32 ADC.

Fixes: 090992a9 ("ARM: dts: stm32: enable ADC on stm32h743i-eval
board")
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32h743i-eval.dts

@@ -87,6 +87,7 @@ usbotg_hs_phy: usb-phy {
 };
 
 &adc_12 {
+	vdda-supply = <&vdda>;
 	vref-supply = <&vdda>;
 	status = "okay";
 	adc1: adc@0 {