ARM: dts: sun7i: 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 A20 FEX files in the
sunxi-boards repository. Not all boards have the same settings. The
settings in this patch are the most generic ones.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -87,10 +87,26 @@ cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		cpu@0 {
+		cpu0: cpu@0 {
 			compatible = "arm,cortex-a7";
 			device_type = "cpu";
 			reg = <0>;
+			clocks = <&cpu>;
+			clock-latency = <244144>; /* 8 32k periods */
+			operating-points = <
+				/* kHz    uV */
+				1008000 1450000
+				960000  1400000
+				912000  1400000
+				864000  1300000
+				720000  1200000
+				528000  1100000
+				312000  1000000
+				144000  900000
+				>;
+			#cooling-cells = <2>;
+			cooling-min-level = <0>;
+			cooling-max-level = <7>;
 		};
 
 		cpu@1 {