msm: Add QCN SDIO core driver

QCN SDIO function-1 driver

==========================

The QCN7605 device uses a Q6-WCSS DSP co-processor. The Q6-WCSS requires a

firmware binary to boot. The QCN SDIO function-1 driver provides the means with

to communicate with the device. The commuincation involves firmware download,

multiprocessor communication, and other subsytem's coreesponding data download

and upload.

Example: WLAN traffic, WLAN BDF, M3 or CALDATA download etc.

QCN SDIO Device Node:

=====================

A QCN SDIO device node is used to represent the function-1 driver instance. It

is needed as a child node to SOC parent node through which it is accessible to

the host.

Required properties:

--------------------

- compatible:		Should be one of,

				"qcom,qcn-sdio" for MSM8996 SOCs

Example:

--------

/* MSM8996 */

soc {

	qcom,qcn-sdio {

		compatible = "qcom,qcn-sdio";

	}

};

config SDIO_QCN

	tristate "Qualcomm Technologies, Inc SDIO Function 1 Driver"

	depends on MMC

	default n

	help

	  This module adds the support for SDIO based Wi-Fi devices with QCN7605

	  chipsets. This module interfaces the diag, IPC router, Qsahara and

	  WLAN driver with the external sdio based soc.

obj-$(CONFIG_SDIO_QCN)	+= qcn_sdio.o