oxnas: kd20: correct memory size to 256MB

Signed-off-by: Daniel Golle <[email protected]>

target/linux/oxnas/files/arch/arm/boot/dts/ox820-shuttle-kd20.dts

@@ -15,8 +15,8 @@
 	};
 
 	memory {
-		/* 128Mbytes DDR */
-		reg = <0x60000000 0x8000000>;
+		/* 256Mbytes DDR */
+		reg = <0x60000000 0x10000000>;
 	};
 
 	aliases {