staging: wilc1000: rename strStaParams variable to avoid camelCase

This is a cleanup patch to rename strStaParams to sta_params to avoid
camelCase.
Changes fix "Avoid camelCase" issue reported by checkpatch.pl
script.

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