staging: wilc1000: use single struct for 'connect' related parameters

Use single structure to store the connect request and response
information. It helped in avoiding unnecessary buffer allocation to
handle request and response flow.

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