Wireless RF Power Driver

The wireless RF power driver (WRFPWR) instantiates and manages
power to the wireless RF regulator. The wireless RF power driver
terminates at the lower level in calls to the regulator driver
(see regulator-fixed binding). The regulator driver are used to
control power to the differnt regulator through gpio in the system.

Required properties:

- compatible:
    Must be "brcm,wrfpwr"

- dev-name:
    Default name assigned as "wrfpwr".

- wrfpwr-supply-names:
    Names of voltage regulators that can be turn off/on by the driver.
    This is a string list.

- vreg-wifi-rf-pwr-supply:
    A collection of phandles to a regulator nodes, see
    Documentation/devicetree/bindings/regulator/ for specific
    bindings. The number and order of phandles must match
    exactly the number of strings in the "wrfpwr-supply-names" property.

Example:

	wifi_rfpwr: wifi_rfpwr {
		compatible = "brcm,wrfpwr";
		dev-name = "wrfpwr";
		supply-names = "vreg-wifi-rf-pwr";
		vreg-wifi-rf-pwr-supply = <&vreg_wifi_rf_pwr>;
	};
