ARM: zynq: Switch from earlyprintk to earlycon

Switch to earlycon which is preffered over earlyprintk.
It is also sync with Linux kernel (zynq-microzed).

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/d280fa18068f80412cf12c235c5245651e7062e2.1679987839.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynq-microzed.dts b/arch/arm/dts/zynq-microzed.dts
index 875ee08..b95eb3e 100644
--- a/arch/arm/dts/zynq-microzed.dts
+++ b/arch/arm/dts/zynq-microzed.dts
@@ -23,7 +23,7 @@
 	};
 
 	chosen {
-		bootargs = "earlyprintk";
+		bootargs = "earlycon";
 		stdout-path = "serial0:115200n8";
 	};