ARM: dts: imx28-m28/sps1: Convert to use label references

These board files 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 orer to make it
easier to maintain.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Wolfgang Grandegger <wg@aries-embedded.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx28-m28.dtsi

@@ -14,31 +14,6 @@
 		reg = <0x40000000 0x08000000>;
 	};
 
-	apb@80000000 {
-		apbh@80000000 {
-			nand-controller@8000c000 {
-				#address-cells = <1>;
-				#size-cells = <1>;
-				pinctrl-names = "default";
-				pinctrl-0 = <&gpmi_pins_a &gpmi_status_cfg>;
-				status = "okay";
-			};
-		};
-
-		apbx@80040000 {
-			i2c0: i2c@80058000 {
-				pinctrl-names = "default";
-				pinctrl-0 = <&i2c0_pins_a>;
-				status = "okay";
-
-				rtc: rtc@68 {
-					compatible = "st,m41t62";
-					reg = <0x68>;
-				};
-			};
-		};
-	};
-
 	regulators {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -54,3 +29,22 @@
 		};
 	};
 };
+
+&gpmi {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&gpmi_pins_a &gpmi_status_cfg>;
+	status = "okay";
+};
+
+&i2c0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c0_pins_a>;
+	status = "okay";
+
+	rtc: rtc@68 {
+		compatible = "st,m41t62";
+		reg = <0x68>;
+	};
+};