ARM: at91/dt: sama5d4 xplained: use stdout-path

Use stdout-path to specify the console and remove the console argument from
the kernel command line.

Signed-off-by: Alexandre Belloni <[e-mail]>
Signed-off-by: Nicolas Ferre <[e-mail]>

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

···
 	compatible = "atmel,sama5d4-xplained", "atmel,sama5d4", "atmel,sama5";
 
 	chosen {
-		bootargs = "console=ttyS0,115200 ignore_loglevel earlyprintk";
+		bootargs = "ignore_loglevel earlyprintk";
+		stdout-path = "serial0:115200n8";
 	};
 
 	memory {