ARM: dts: stm32: fix dma controller node name on stm32mp157c

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/stm32mp151.dtsi

@@ -947,7 +947,7 @@ dfsdm5: filter@5 {
 			};
 		};
 
-		dma1: dma@48000000 {
+		dma1: dma-controller@48000000 {
 			compatible = "st,stm32-dma";
 			reg = <0x48000000 0x400>;
 			interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
@@ -964,7 +964,7 @@ dma1: dma@48000000 {
 			dma-requests = <8>;
 		};
 
-		dma2: dma@48001000 {
+		dma2: dma-controller@48001000 {
 			compatible = "st,stm32-dma";
 			reg = <0x48001000 0x400>;
 			interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>,
@@ -1275,7 +1275,7 @@ rng1: rng@54003000 {
 			status = "disabled";
 		};
 
-		mdma1: dma@58000000 {
+		mdma1: dma-controller@58000000 {
 			compatible = "st,stm32h7-mdma";
 			reg = <0x58000000 0x1000>;
 			interrupts = <GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>;