ARM: dts: Use labels for overriding nodes in exynos4412

Usage of labels instead of full paths reduces possible mistakes when
overriding nodes.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos4412.dtsi

@@ -54,19 +54,19 @@ cpu@A03 {
 		};
 	};
 
-	combiner: interrupt-controller@10440000 {
-		samsung,combiner-nr = <20>;
-	};
-
 	pmu {
 		interrupts = <2 2>, <3 2>, <18 2>, <19 2>;
 	};
+};
 
-	gic: interrupt-controller@10490000 {
-		cpu-offset = <0x4000>;
-	};
-
-	pmu_system_controller: system-controller@10020000 {
+&pmu_system_controller {
 	compatible = "samsung,exynos4412-pmu", "syscon";
-	};
+};
+
+&combiner {
+	samsung,combiner-nr = <20>;
+};
+
+&gic {
+	cpu-offset = <0x4000>;
 };