ARM: dts: Remove unused bootargs from exynos3250-rinato

This patch removes unused dt node of command line from Exynos3250-based
Rinato board because kernel use the command line from bootloader.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos3250-rinato.dts

@@ -28,10 +28,6 @@ memory {
 		reg =  <0x40000000 0x1ff00000>;
 	};
 
-	chosen {
-		bootargs = "console=ttySAC1,115200N8 root=/dev/mmcblk0p15 rootwait earlyprintk panic=5";
-	};
-
 	firmware@0205F000 {
 		compatible = "samsung,secure-firmware";
 		reg = <0x0205F000 0x1000>;