ARM: dts: Split memory sections for exynos4210-origen

This patch changes memory configuration defined in dts file of Origen
board from single 1 GiB section into four 256 MiB sections to match
section size limit.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos4210-origen.dts

@@ -22,7 +22,10 @@ / {
 	compatible = "insignal,origen", "samsung,exynos4210";
 
 	memory {
-		reg = <0x40000000 0x40000000>;
+		reg = <0x40000000 0x10000000
+		       0x50000000 0x10000000
+		       0x60000000 0x10000000
+		       0x70000000 0x10000000>;
 	};
 
 	chosen {