ARM: dts: at91: Enable DMA on sama5d2_xplained console

BugLink: http://bugs.launchpad.net/bugs/1673538

commit 78162d48 upstream.

Enable DMA on uart1 to get a more reliable console.
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

arch/arm/boot/dts/at91-sama5d2_xplained.dts

@@ -122,6 +122,8 @@ macb0: ethernet@f8008000 {
 			uart1: serial@f8020000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&pinctrl_uart1_default>;
+				atmel,use-dma-rx;
+				atmel,use-dma-tx;
 				status = "okay";
 			};