ARM: dts: imx6qdl-icore: Add missing stdout-path property

This would help us to get early boot logs by passing "earlycon" to
kernel bootargs.

Further, by adding this we don't have to depend on complex earlyprintk
configs for early boot logs.
Reviewed-by: NFabio Estevam <festevam@gmail.com>
Signed-off-by: NShyam Saini <shyam.saini@amarulasolutions.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-icore.dtsi

@@ -13,6 +13,10 @@
 		reg = <0x10000000 0x80000000>;
 	};
 
+	chosen {
+		stdout-path = &uart4;
+	};
+
 	backlight_lvds: backlight-lvds {
 		compatible = "pwm-backlight";
 		pwms = <&pwm3 0 100000>;