ARM: dts: exynos: Move CPU OPP tables out of SoC node on Exynos5420

The cpus node is a top-level node, not inside the soc.  Therefore its
OPP tables should be there as well.

This also fixes the DTC warnings like:

    arch/arm/boot/dts/exynos5420.dtsi:46.37-109.5:
        Warning simple_bus_reg): /soc/opp_table0: missing or empty reg/ranges property
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/boot/dts/exynos5420.dtsi

@@ -42,10 +42,10 @@ aliases {
 	 * by exynos5420-cpus.dtsi or exynos5422-cpus.dtsi.
 	 */
 
-	soc: soc {
 	cluster_a15_opp_table: opp_table0 {
 		compatible = "operating-points-v2";
 		opp-shared;
+
 		opp-1800000000 {
 			opp-hz = /bits/ 64 <1800000000>;
 			opp-microvolt = <1250000>;
@@ -111,6 +111,7 @@ opp-700000000 {
 	cluster_a7_opp_table: opp_table1 {
 		compatible = "operating-points-v2";
 		opp-shared;
+
 		opp-1300000000 {
 			opp-hz = /bits/ 64 <1300000000>;
 			opp-microvolt = <1275000>;
@@ -153,6 +154,7 @@ opp-600000000 {
 		};
 	};
 
+	soc: soc {
 		cci: cci@10d20000 {
 			compatible = "arm,cci-400";
 			#address-cells = <1>;