ARM: dts: imx23: Fix memory node duplication

Boards based on imx23 have duplicate memory nodes:

- One coming from the board dts file: memory@

- One coming from the imx23.dtsi file.

Fix the duplication by removing the memory node from the dtsi file
and by adding 'device_type = "memory";' in the board dts.
Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx23-evk.dts

@@ -10,6 +10,7 @@ / {
 	compatible = "fsl,imx23-evk", "fsl,imx23";
 
 	memory@40000000 {
+		device_type = "memory";
 		reg = <0x40000000 0x08000000>;
 	};
 

arch/arm/boot/dts/imx23-olinuxino.dts

@@ -20,6 +20,7 @@ / {
 	compatible = "olimex,imx23-olinuxino", "fsl,imx23";
 
 	memory@40000000 {
+		device_type = "memory";
 		reg = <0x40000000 0x04000000>;
 	};
 

arch/arm/boot/dts/imx23-sansa.dts

@@ -50,6 +50,7 @@ / {
 	compatible = "sandisk,sansa_fuze_plus", "fsl,imx23";
 
 	memory@40000000 {
+		device_type = "memory";
 		reg = <0x40000000 0x04000000>;
 	};
 

arch/arm/boot/dts/imx23-stmp378x_devb.dts

@@ -17,6 +17,7 @@ / {
 	compatible = "fsl,stmp378x-devb", "fsl,imx23";
 
 	memory@40000000 {
+		device_type = "memory";
 		reg = <0x40000000 0x04000000>;
 	};
 

arch/arm/boot/dts/imx23-xfi3.dts

@@ -49,6 +49,7 @@ / {
 	compatible = "creative,x-fi3", "fsl,imx23";
 
 	memory@40000000 {
+		device_type = "memory";
 		reg = <0x40000000 0x04000000>;
 	};
 

arch/arm/boot/dts/imx23.dtsi

@@ -13,10 +13,8 @@ / {
 	 * The decompressor and also some bootloaders rely on a
 	 * pre-existing /chosen node to be available to insert the
 	 * command line and merge other ATAGS info.
-	 * Also for U-Boot there must be a pre-existing /memory node.
 	 */
 	chosen {};
-	memory { device_type = "memory"; };
 
 	aliases {
 		gpio0 = &gpio0;