staging: wilc1000: remove ununsed variable & associated code

This patch removes the ununsed variable 'priv' at multiple instances and
all its associated code where its assigned a value.

Signed-off-by: Hari Prasath Gujulan Elango <hgujulan@visteon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>