ARM: dts: imx28-ts4600: Convert to use label references

This Technologic board file still use node name and unit address
to reference parts from the imx28.dtsi . This causes a lot of
redundancy. So use label references in order to make it easier
to maintain.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx28-ts4600.dts

@@ -18,22 +18,24 @@ memory@40000000 {
 		reg = <0x40000000 0x10000000>;   /* 256MB */
 	};
 
-	apb@80000000 {
-		apbh@80000000 {
-			ssp0: spi@80010000 {
-				compatible = "fsl,imx28-mmc";
-				pinctrl-names = "default";
-				pinctrl-0 = <&mmc0_4bit_pins_a
-					     &mmc0_sck_cfg
-					     &en_sd_pwr>;
-				broken-cd;
-				bus-width = <4>;
-				vmmc-supply = <&reg_vddio_sd0>;
-				status = "okay";
+	reg_vddio_sd0: regulator-vddio-sd0 {
+		compatible = "regulator-fixed";
+		regulator-name = "vddio-sd0";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		gpio = <&gpio3 28 GPIO_ACTIVE_LOW>;
 	};
 
-			pinctrl@80018000 {
+};
+
+&duart {
+	pinctrl-names = "default";
+	pinctrl-0 = <&duart_pins_a>;
+	status = "okay";
+};
 
+&pinctrl {
 	en_sd_pwr: en-sd-pwr@0 {
 		reg = <0>;
 		fsl,pinmux-ids = <
@@ -43,32 +45,22 @@ MX28_PAD_PWM3__GPIO_3_28
 		fsl,voltage = <MXS_VOLTAGE_HIGH>;
 		fsl,pull-up = <MXS_PULL_DISABLE>;
 	};
+};
 
-			};
-		};
-
-		apbx@80040000 {
-			pwm: pwm@80064000 {
+&pwm {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pwm2_pins_a>;
 	status = "okay";
-			};
+};
 
-			duart: serial@80074000 {
+&ssp0 {
+	compatible = "fsl,imx28-mmc";
 	pinctrl-names = "default";
-				pinctrl-0 = <&duart_pins_a>;
+	pinctrl-0 = <&mmc0_4bit_pins_a
+		     &mmc0_sck_cfg
+		     &en_sd_pwr>;
+	broken-cd;
+	bus-width = <4>;
+	vmmc-supply = <&reg_vddio_sd0>;
 	status = "okay";
-			};
-		};
-	};
-
-	reg_vddio_sd0: regulator-vddio-sd0 {
-		compatible = "regulator-fixed";
-		regulator-name = "vddio-sd0";
-		regulator-min-microvolt = <3300000>;
-		regulator-max-microvolt = <3300000>;
-		regulator-boot-on;
-		gpio = <&gpio3 28 GPIO_ACTIVE_LOW>;
-	};
-
 };