ARM: dts: imx27: Fix memory node duplication

Boards based on imx27 have duplicate memory nodes:

- One coming from the board dts file: memory@

- One coming from the imx27.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/imx27-apf27.dts

@@ -20,6 +20,7 @@ / {
 	compatible = "armadeus,imx27-apf27", "fsl,imx27";
 
 	memory@a0000000 {
+		device_type = "memory";
 		reg = <0xa0000000 0x04000000>;
 	};
 };

arch/arm/boot/dts/imx27-eukrea-cpuimx27.dtsi

@@ -17,6 +17,7 @@ / {
 	compatible = "eukrea,cpuimx27", "fsl,imx27";
 
 	memory@a0000000 {
+		device_type = "memory";
 		reg = <0xa0000000 0x04000000>;
 	};
 

arch/arm/boot/dts/imx27-pdk.dts

@@ -10,6 +10,7 @@ / {
 	compatible = "fsl,imx27-pdk", "fsl,imx27";
 
 	memory@a0000000 {
+		device_type = "memory";
 		reg = <0xa0000000 0x08000000>;
 	};
 

arch/arm/boot/dts/imx27-phytec-phycard-s-som.dtsi

@@ -18,6 +18,7 @@ / {
 	compatible = "phytec,imx27-pca100", "fsl,imx27";
 
 	memory@a0000000 {
+		device_type = "memory";
 		reg = <0xa0000000 0x08000000>; /* 128MB */
 	};
 };

arch/arm/boot/dts/imx27-phytec-phycore-som.dtsi

@@ -17,6 +17,7 @@ / {
 	compatible = "phytec,imx27-pcm038", "fsl,imx27";
 
 	memory@a0000000 {
+		device_type = "memory";
 		reg = <0xa0000000 0x08000000>;
 	};
 

arch/arm/boot/dts/imx27.dtsi

@@ -16,10 +16,8 @@ / {
 	 * 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 {
 		ethernet0 = &fec;