Documentation: bindings: add the Berlin CPU control doc

Document the CPU control compatible, needed for the SMP support on
Marvell Berlin SoCs.

Signed-off-by: Antoine Ténart <[e-mail]>
Signed-off-by: Sebastian Hesselbarth <[e-mail]>

Documentation/devicetree/bindings/arm/marvell,berlin.txt

···
 	...
 }
 
+* Marvell Berlin CPU control bindings
+
+CPU control register allows various operations on CPUs, like resetting them
+independently.
+
+Required properties:
+- compatible: should be "marvell,berlin-cpu-ctrl"
+- reg: address and length of the register set
+
+Example:
+
+cpu-ctrl@f7dd0000 {
+	compatible = "marvell,berlin-cpu-ctrl";
+	reg = <0xf7dd0000 0x10000>;
+};
+
 * Marvell Berlin2 chip control binding
 
 Marvell Berlin SoCs have a chip control register set providing several