dm: exynos: Mark exynos5 console as pre-reloc

We will need the console before relocation, so mark it that way.
Signed-off-by: NSimon Glass <sjg@chromium.org>

arch/arm/dts/exynos5.dtsi

@@ -244,6 +244,7 @@
 		compatible = "samsung,exynos4210-uart";
 		reg = <0x12C30000 0x100>;
 		interrupts = <0 54 0>;
+		u-boot,dm-pre-reloc;
 		id = <3>;
 	};