arm64: dts: exynos: Assign parent clock of the clkout clock for TM2 board

Without this patch the clkout clock is orphaned and sound doesn't
work properly.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm64/boot/dts/exynos/exynos5433-tm2.dts

@@ -905,6 +905,11 @@ i80-if-timings {
 	};
 };
 
+&pmu_system_controller {
+	assigned-clocks = <&pmu_system_controller 0>;
+	assigned-clock-parents = <&xxti>;
+};
+
 &serial_1 {
 	status = "okay";
 };