ARM: dts: at91: sama5d4 Xplained: enable UART1 node with DMA

Enable UART1 and use DMA configuration with it.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/at91-sama5d4_xplained.dts

@@ -69,6 +69,12 @@ main_xtal {
 
 	ahb {
 		apb {
+			uart0: serial@f8004000 {
+				atmel,use-dma-rx;
+				atmel,use-dma-tx;
+				status = "okay";
+			};
+
 			spi0: spi@f8010000 {
 				cs-gpios = <&pioC 3 0>, <0>, <0>, <0>;
 				status = "okay";