ARM: dts: stm32: fix dma controller node name on stm32f743

Modify dma controller nodes name to fit with the standard naming.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32h743.dtsi

@@ -231,7 +231,7 @@ spi5: spi@40015000 {
 			status = "disabled";
 		};
 
-		dma1: dma@40020000 {
+		dma1: dma-controller@40020000 {
 			compatible = "st,stm32-dma";
 			reg = <0x40020000 0x400>;
 			interrupts = <11>,
@@ -249,7 +249,7 @@ dma1: dma@40020000 {
 			status = "disabled";
 		};
 
-		dma2: dma@40020400 {
+		dma2: dma-controller@40020400 {
 			compatible = "st,stm32-dma";
 			reg = <0x40020400 0x400>;
 			interrupts = <56>,
@@ -329,7 +329,7 @@ usbotg_fs: usb@40080000 {
 			status = "disabled";
 		};
 
-		mdma1: dma@52000000 {
+		mdma1: dma-controller@52000000 {
 			compatible = "st,stm32h7-mdma";
 			reg = <0x52000000 0x1000>;
 			interrupts = <122>;