staging: wilc1000: removed unused element from wilc_cfg_frame struct

Cleanup up patch to remove the unused structure elements in
'wilc_cfg_frame' struct.

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>