Broadcom BCM43xx wireless devices

This provides documentation of common properties that are valid for controlling
the Broadcom BCM43xx wireless device.

Required properties:

- compatible : Should be "android,bcmdhd_wlan".

- wl_reg_on : specifies attributes for the power regulator

- ch-num: specifies attributes for PCIe channel of wlan

Optional properties:

- wl_host_wake : specifies attributes for the out-of-band interrupt

Example:

wlan {
    compatible = "android,bcmdhd_wlan";
    wl_reg_on = <&gpg1 0 0x1>; /* wifi reg_on pin */
    wl_host_wake = <&gpa3 0 0x1>; /* wifi oob pin */
    ch-num = <0>; /* wifi pcie interface number*/
    pinctrl-names = "default";
    pinctrl-0 = <&cfg_wlanen &wlan_host_wake>;
    status = "okay";
};