ARM: shmobile: kzm9g-reference: Remove early_printk from command line

As early printk is not supported when devices are initialised
using DT, so remove it from the command line.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/sh73a0-kzm9g-reference.dts

@@ -35,7 +35,7 @@ cpu@0 {
 	};
 
 	chosen {
-		bootargs = "console=tty0 console=ttySC4,115200 root=/dev/nfs ip=dhcp ignore_loglevel earlyprintk=sh-sci.4,115200 rw";
+		bootargs = "console=tty0 console=ttySC4,115200 root=/dev/nfs ip=dhcp ignore_loglevel rw";
 	};
 
 	memory {