ARM: dts: ls1021a: add #dma-cells to qdma node

Add the #dma-cells to align with the dma schema.

Signed-off-by: Li Yang <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/ls1021a.dtsi

···
 				     <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "qdma-error",
 				"qdma-queue0", "qdma-queue1";
+			#dma-cells = <2>;
 			dma-channels = <8>;
 			block-number = <1>;
 			block-offset = <0x1000>;