* palmas clock IP block devicetree bindings

Required properties:
- compatible : Must be "ti,palmas-clk".

Optional sub-nodes:
 The Palmas clock node have the subnode to configure the Palmas'c clock.
 The subnode name should match with the name of the clocks.

 The valid clock names are: clk32k_kg and clk32k_kg_audio.

- ti,clock-boot-enable: Enable the clock on boot time.
- ti,external-sleep-control: Sleep control for the clock. The clock
	is enabled/disabled through external pins.
	The valid value for external pins are:
			ENABLE1 then 1,
			ENABLE2 then 2 or
			NSLEEP then 3.
Example:

pmic {
	compatible = "ti,twl6035-pmic", "ti,palmas-pmic";
	...
	clocks {
		compatible = "ti,palmas-clk";
		clk32k_kg {
			ti,clock-boot-enable;
			ti,external-sleep-control = <3>;
		}

		clk32k_kg_audio {
			ti,clock-boot-enable;
		};
	};
	...
};
