dt-bindings: memory: tegra20: emc: Correct registers range in example

There is superfluous zero in the registers base address and registers
size should be twice bigger.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201104164923.21238-5-digetx@gmail.comSigned-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt

@@ -21,7 +21,7 @@ Example:
 		#address-cells = < 1 >;
 		#size-cells = < 0 >;
 		compatible = "nvidia,tegra20-emc";
-		reg = <0x7000f4000 0x200>;
+		reg = <0x7000f400 0x400>;
 		interrupts = <0 78 0x04>;
 		clocks = <&tegra_car TEGRA20_CLK_EMC>;
 	}