ARM: at91/dt: at91rm9200ek: use stdout-path

Use stdout-path to specify the console.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91rm9200ek.dts

@@ -12,6 +12,10 @@
 	model = "Atmel AT91RM9200 evaluation kit";
 	compatible = "atmel,at91rm9200ek", "atmel,at91rm9200";
 
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
 	memory {
 		reg = <0x20000000 0x4000000>;
 	};