staging: wilc1000: avoid the use of the static variable to configure wiphy struct

Refactor code to avoid the use of static variables to configure the
'wiphy' structure. Now move static variables as part of 'priv' data so
it helped to maintain this information per interface.

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