arm: dt: zynq: Add 'cpus' node

Add a 'cpus' node to describe the CPU cores of Zynq.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/boot/dts/zynq-7000.dtsi

@@ -15,6 +15,25 @@
 / {
 	compatible = "xlnx,zynq-7000";
 
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			compatible = "arm,cortex-a9";
+			device_type = "cpu";
+			reg = <0>;
+			clocks = <&clkc 3>;
+		};
+
+		cpu@1 {
+			compatible = "arm,cortex-a9";
+			device_type = "cpu";
+			reg = <1>;
+			clocks = <&clkc 3>;
+		};
+	};
+
 	pmu {
 		compatible = "arm,cortex-a9-pmu";
 		interrupts = <0 5 4>, <0 6 4>;