arm64: dts: imx8mp: add uart2 dma

Add DMA properties to uart2 node.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp.dtsi

@@ -693,6 +693,8 @@ uart2: serial@30890000 {
 				clocks = <&clk IMX8MP_CLK_UART2_ROOT>,
 					 <&clk IMX8MP_CLK_UART2_ROOT>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma1 24 4 0>, <&sdma1 25 4 0>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};