ARM: at91/dt: sama5d3 xplained: use stdout-path

Use stdout-path to specify the console and remove the bootargs.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91-sama5d3_xplained.dts

@@ -14,7 +14,7 @@ / {
 	compatible = "atmel,sama5d3-xplained", "atmel,sama5d3", "atmel,sama5";
 
 	chosen {
-		bootargs = "console=ttyS0,115200";
+		stdout-path = "serial0:115200n8";
 	};
 
 	memory {