clk: bcm2835: Add bindings for the auxiliary peripheral clock gates.

Broadcom BCM2835 auxiliary peripheral support

This binding uses the common clock binding:

    Documentation/devicetree/bindings/clock/clock-bindings.txt

The auxiliary peripherals (UART, SPI1, and SPI2) have a small register

area controlling clock gating to the peripherals, and providing an IRQ

status register.

Required properties:

- compatible:	Should be "brcm,bcm2835-aux"

- #clock-cells:	Should be <1>. The permitted clock-specifier values can be

		  found in include/dt-bindings/clock/bcm2835-aux.h

- reg:		Specifies base physical address and size of the registers

- clocks:	The parent clock phandle

Example:

	clocks: cprman@7e101000 {

		compatible = "brcm,bcm2835-cprman";

		#clock-cells = <1>;

		reg = <0x7e101000 0x2000>;

		clocks = <&clk_osc>;

	};

	aux: aux@0x7e215004 {

		compatible = "brcm,bcm2835-aux";

		#clock-cells = <1>;

		reg = <0x7e215000 0x8>;

		clocks = <&clocks BCM2835_CLOCK_VPU>;

	};

/*

 * Copyright (C) 2015 Broadcom Corporation

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#define BCM2835_AUX_CLOCK_UART		0

#define BCM2835_AUX_CLOCK_SPI1		1

#define BCM2835_AUX_CLOCK_SPI2		2

#define BCM2835_AUX_CLOCK_COUNT		3