ARM: zynq: Fix bootargs in board dtsi

- Sync with Linux kernel
- Remove rootfs
- Remove earlyprintk

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/dts/zynq-zybo.dts b/arch/arm/dts/zynq-zybo.dts
index d04e962..acc6e42 100644
--- a/arch/arm/dts/zynq-zybo.dts
+++ b/arch/arm/dts/zynq-zybo.dts
@@ -26,7 +26,7 @@
 	};
 
 	chosen {
-		bootargs = "earlyprintk";
+		bootargs = "";
 		stdout-path = "serial0:115200n8";
 	};