ARM: dts: sun5i: Add cpu clock reference and operating points to dtsi

The cpu core is clocked from the "cpu" clock. Add a reference to it
in the first cpu node. Also add "cpu0" label to the node.

The operating points were taken from the A13 FEX files in the
sunxi-boards repository. All FEX files have the same settings.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun5i-a13.dtsi

@@ -27,10 +27,26 @@ aliases {
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
-		cpu@0 {
+
+		cpu0: cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a8";
 			reg = <0x0>;
+			clocks = <&cpu>;
+			clock-latency = <244144>; /* 8 32k periods */
+			operating-points = <
+				/* kHz    uV */
+				1104000	1500000
+				1008000 1400000
+				912000  1350000
+				864000  1300000
+				624000  1200000
+				576000  1200000
+				432000  1200000
+				>;
+			#cooling-cells = <2>;
+			cooling-min-level = <0>;
+			cooling-max-level = <6>;
 		};
 	};