lantiq: ltq-vdsl-app: update to version 4.16.6.3

In this upstream dsl driver app version the autoboot is deactivated activate
it again.
In addition to the update this also fixes some build warnings and makes it
use the same configure option as used in Lantiq UGW.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@lantiq.com>

SVN-Revision: 47637