staging: line6: drop dump requests from variax startup

The variax startup procedure dumps model data.  This is no longer useful
since the sysfs attrs which expose this information to userspace have
been removed.  The dump request wasn't been processed anymore.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>