arm64: dts: exynos: Move syscon poweroff and restart nodes under the PMU

The PMU node is the actual block responsible for power management,
including typical Exynos on/off/restart procedures.  Therefore the
syscon poweroff and restart nodes logically belong to it.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

arch/arm64/boot/dts/exynos/exynos5433.dtsi

@@ -231,13 +231,6 @@ psci {
 		cpu_on = <0xC4000003>;
 	};
 
-	reboot: syscon-reboot {
-		compatible = "syscon-reboot";
-		regmap = <&pmu_system_controller>;
-		offset = <0x400>; /* SWRESET */
-		mask = <0x1>;
-	};
-
 	soc: soc {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -799,6 +792,13 @@ pmu_system_controller: system-controller@105c0000 {
 			#clock-cells = <1>;
 			clock-names = "clkout16";
 			clocks = <&xxti>;
+
+			reboot: syscon-reboot {
+				compatible = "syscon-reboot";
+				regmap = <&pmu_system_controller>;
+				offset = <0x400>; /* SWRESET */
+				mask = <0x1>;
+			};
 		};
 
 		gic: interrupt-controller@11001000 {

arch/arm64/boot/dts/exynos/exynos7.dtsi

@@ -494,13 +494,13 @@ timer {
 		pmu_system_controller: system-controller@105c0000 {
 			compatible = "samsung,exynos7-pmu", "syscon";
 			reg = <0x105c0000 0x5000>;
-		};
 
-		reboot: syscon-reboot {
-			compatible = "syscon-reboot";
-			regmap = <&pmu_system_controller>;
-			offset = <0x0400>;
-			mask = <0x1>;
+			reboot: syscon-reboot {
+				compatible = "syscon-reboot";
+				regmap = <&pmu_system_controller>;
+				offset = <0x0400>;
+				mask = <0x1>;
+			};
 		};
 
 		rtc: rtc@10590000 {