ARM: dts: stm32: Enable dma by default on stm32f4 adc

Configure STM32F4 ADC to use dma by default.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429.dtsi

@@ -450,6 +450,8 @@ adc1: adc@0 {
 				clocks = <&rcc 0 STM32F4_APB2_CLOCK(ADC1)>;
 				interrupt-parent = <&adc>;
 				interrupts = <0>;
+				dmas = <&dma2 0 0 0x400 0x0>;
+				dma-names = "rx";
 				status = "disabled";
 			};
 
@@ -460,6 +462,8 @@ adc2: adc@100 {
 				clocks = <&rcc 0 STM32F4_APB2_CLOCK(ADC2)>;
 				interrupt-parent = <&adc>;
 				interrupts = <1>;
+				dmas = <&dma2 3 1 0x400 0x0>;
+				dma-names = "rx";
 				status = "disabled";
 			};
 
@@ -470,6 +474,8 @@ adc3: adc@200 {
 				clocks = <&rcc 0 STM32F4_APB2_CLOCK(ADC3)>;
 				interrupt-parent = <&adc>;
 				interrupts = <2>;
+				dmas = <&dma2 1 2 0x400 0x0>;
+				dma-names = "rx";
 				status = "disabled";
 			};
 		};