ARM: dts: Fix typo earlyprintk in exynos5440-sd5v1 and ssdk5440 boards

This patch removes '_' from "early_prink" on Exynos5440 dts
files in according to kernel-parameters document.
Signed-off-by: Youngmin Nam <youngmin.nam@samsung.com>
Reviewed-by: Sachin Kamat <sachin.kamat@linaro.org>
Tested-by: Jungseok Lee <jays.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5440-sd5v1.dts

@@ -17,7 +17,7 @@ / {
 	compatible = "samsung,sd5v1", "samsung,exynos5440";
 
 	chosen {
-		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel early_printk no_console_suspend mem=2048M@0x80000000 mem=6144M@0x100000000 console=ttySAC0,115200";
+		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel earlyprintk no_console_suspend mem=2048M@0x80000000 mem=6144M@0x100000000 console=ttySAC0,115200";
 	};
 
 	fixed-rate-clocks {

arch/arm/boot/dts/exynos5440-ssdk5440.dts

@@ -17,7 +17,7 @@ / {
 	compatible = "samsung,ssdk5440", "samsung,exynos5440";
 
 	chosen {
-		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel early_printk no_console_suspend mem=2048M@0x80000000 mem=6144M@0x100000000 console=ttySAC0,115200";
+		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel earlyprintk no_console_suspend mem=2048M@0x80000000 mem=6144M@0x100000000 console=ttySAC0,115200";
 	};
 
 	spi_0: spi@D0000 {