staging: wilc1000: remove 'rxq_entries' from 'wilc' struct

Removed unnecessary 'rxq_entries' element from 'wilc' struct, as its
value is not used.

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>