ARM: dts: qcom: mdm9615: User generic node name for DMA

Qcom BAM DT spec expects generic DMA controller node name as
"dma-controller" to enable validations.

Signed-off-by: Kuldeep Singh <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/qcom-mdm9615.dtsi

···
 			};
 		};
 
-		sdcc1bam: dma@12182000{
+		sdcc1bam: dma-controller@12182000{
 			compatible = "qcom,bam-v1.3.0";
 			reg = <0x12182000 0x8000>;
 			interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
···
 			qcom,ee = <0>;
 		};
 
-		sdcc2bam: dma@12142000{
+		sdcc2bam: dma-controller@12142000{
 			compatible = "qcom,bam-v1.3.0";
 			reg = <0x12142000 0x8000>;
 			interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;