staging: wilc1000: move macro and function prototype from wilc_wlan_if.h file

Move data structure and function prototype from 'wilc_wlan_if.h file.
Now, this file contains constant specific to the firmware.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>