ARM: dt: tegra: remove duplicate device_type property

It's already specified in skeleton.dtsi, included via tegra20.dtsi.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NOlof Johansson <olof@lixom.net>

arch/arm/boot/dts/tegra-seaboard.dts

@@ -7,7 +7,6 @@
 	compatible = "nvidia,seaboard", "nvidia,tegra20";
 
 	memory {
-		device_type = "memory";
 		reg = <0x00000000 0x40000000>;
 	};