net: cnss: refactoring CNSS SDIO platform Driver

Configure kernel config flag for CNSS SDIO platform
driver. CONFIG_CNSS_SDIO Kernel config add support to
CNSS platform driver compilation for SDIO based WiFi
devices and export platform driver API's based on
the SDIO bus.

Change-Id: I16171f78745e32054de7c49113616ffb134d7de8
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>