ARM: dts: Add DMA support for serial ports in exynos4

Enable DMA transfers for serial ports.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

arch/arm/boot/dts/exynos4.dtsi

@@ -431,6 +431,8 @@ serial_0: serial@13800000 {
 		interrupts = <0 52 0>;
 		clocks = <&clock CLK_UART0>, <&clock CLK_SCLK_UART0>;
 		clock-names = "uart", "clk_uart_baud0";
+		dmas = <&pdma0 15>, <&pdma0 16>;
+		dma-names = "rx", "tx";
 		status = "disabled";
 	};
 
@@ -440,6 +442,8 @@ serial_1: serial@13810000 {
 		interrupts = <0 53 0>;
 		clocks = <&clock CLK_UART1>, <&clock CLK_SCLK_UART1>;
 		clock-names = "uart", "clk_uart_baud0";
+		dmas = <&pdma1 15>, <&pdma1 16>;
+		dma-names = "rx", "tx";
 		status = "disabled";
 	};
 
@@ -449,6 +453,8 @@ serial_2: serial@13820000 {
 		interrupts = <0 54 0>;
 		clocks = <&clock CLK_UART2>, <&clock CLK_SCLK_UART2>;
 		clock-names = "uart", "clk_uart_baud0";
+		dmas = <&pdma0 17>, <&pdma0 18>;
+		dma-names = "rx", "tx";
 		status = "disabled";
 	};
 
@@ -458,6 +464,8 @@ serial_3: serial@13830000 {
 		interrupts = <0 55 0>;
 		clocks = <&clock CLK_UART3>, <&clock CLK_SCLK_UART3>;
 		clock-names = "uart", "clk_uart_baud0";
+		dmas = <&pdma1 17>, <&pdma1 18>;
+		dma-names = "rx", "tx";
 		status = "disabled";
 	};