arm64: dts: nuvoton: Add missing "device_type" property on memory node

"device_type" is required for memory nodes, but is missing on Nuvoton
npcm845-evb.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

Author: robherring

arch/arm64/boot/dts/nuvoton/nuvoton-npcm845-evb.dts

@@ -17,6 +17,7 @@
 	};
 
 	memory@0 {
+		device_type = "memory";
 		reg = <0x0 0x0 0x0 0x40000000>;
 	};