staging: wilc1000: move 'wilc_connecting' static variable to 'wilc_vif' struct

Move static variable 'wilc_connecting' as part of 'wilc_vif' private
struct. Remove "wilc_" prefix from name as its already part of wilc_vif
struct.

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