ARM: dts: imx51: Add generic DMA bindings for UART nodes

Updates UART nodes to adopt generic DMA bindings.
Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51.dtsi

@@ -215,6 +215,8 @@ uart3: serial@7000c000 {
 					clocks = <&clks IMX5_CLK_UART3_IPG_GATE>,
 						 <&clks IMX5_CLK_UART3_PER_GATE>;
 					clock-names = "ipg", "per";
+					dmas = <&sdma 43 5 1>, <&sdma 44 5 2>;
+					dma-names = "rx", "tx";
 					status = "disabled";
 				};
 
@@ -426,6 +428,8 @@ uart1: serial@73fbc000 {
 				clocks = <&clks IMX5_CLK_UART1_IPG_GATE>,
 					 <&clks IMX5_CLK_UART1_PER_GATE>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma 18 4 1>, <&sdma 19 4 2>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 
@@ -436,6 +440,8 @@ uart2: serial@73fc0000 {
 				clocks = <&clks IMX5_CLK_UART2_IPG_GATE>,
 					 <&clks IMX5_CLK_UART2_PER_GATE>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma 16 4 1>, <&sdma 17 4 2>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};