ARM: dts: imx: use nodes label in board dts

Following omap3-evm.dts way, it changes all imx dts files to use label
in board dts to refer to nodes defined by soc dtsi.  Thus, the board
dts files become easier to read and edit with the least indentation
levels.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/boot/dts/imx27-apf27.dts b/arch/arm/boot/dts/imx27-apf27.dts
index c0327c0..b464c80 100644
--- a/arch/arm/boot/dts/imx27-apf27.dts
+++ b/arch/arm/boot/dts/imx27-apf27.dts
@@ -32,58 +32,54 @@
 			clock-frequency = <0>;
 		};
 	};
+};
 
-	soc {
-		aipi@10000000 {
-			serial@1000a000 {
-				status = "okay";
-			};
+&uart1 {
+	status = "okay";
+};
 
-			ethernet@1002b000 {
-				status = "okay";
-			};
-		};
+&fec {
+	status = "okay";
+};
 
-		nand@d8000000 {
-			status = "okay";
-			nand-bus-width = <16>;
-			nand-ecc-mode = "hw";
-			nand-on-flash-bbt;
+&nfc {
+	status = "okay";
+	nand-bus-width = <16>;
+	nand-ecc-mode = "hw";
+	nand-on-flash-bbt;
 
-			partition@0 {
-				label = "u-boot";
-				reg = <0x0 0x100000>;
-			};
+	partition@0 {
+		label = "u-boot";
+		reg = <0x0 0x100000>;
+	};
 
-			partition@100000 {
-				label = "env";
-				reg = <0x100000 0x80000>;
-			};
+	partition@100000 {
+		label = "env";
+		reg = <0x100000 0x80000>;
+	};
 
-			partition@180000 {
-				label = "env2";
-				reg = <0x180000 0x80000>;
-			};
+	partition@180000 {
+		label = "env2";
+		reg = <0x180000 0x80000>;
+	};
 
-			partition@200000 {
-				label = "firmware";
-				reg = <0x200000 0x80000>;
-			};
+	partition@200000 {
+		label = "firmware";
+		reg = <0x200000 0x80000>;
+	};
 
-			partition@280000 {
-				label = "dtb";
-				reg = <0x280000 0x80000>;
-			};
+	partition@280000 {
+		label = "dtb";
+		reg = <0x280000 0x80000>;
+	};
 
-			partition@300000 {
-				label = "kernel";
-				reg = <0x300000 0x500000>;
-			};
+	partition@300000 {
+		label = "kernel";
+		reg = <0x300000 0x500000>;
+	};
 
-			partition@800000 {
-				label = "rootfs";
-				reg = <0x800000 0xf800000>;
-			};
-		};
+	partition@800000 {
+		label = "rootfs";
+		reg = <0x800000 0xf800000>;
 	};
 };