staging: wilc1000: remove gpio parameter from wilc_netdev_init()

Instead of passing the gpio as parameter to wilc_netdev_init() now
setting its value after finishing wilc_netdev_init() call. Avoided
passing of extra parameter to wilc_netdev_init().

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