ARM: dts: zynq: Fix stdout-path and bootargs

parallella - Remove linux,stdout-path.
Use stdout-path to identify kernel console

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>

arch/arm/boot/dts/zynq-zybo.dts

@@ -29,7 +29,8 @@
 	};
 
 	chosen {
-		bootargs = "console=ttyPS0,115200 earlyprintk";
+		bootargs = "earlyprintk";
+		stdout-path = "serial0:115200n8";
 	};
 
 };