ltq-vdsl-vr11-app: add version 4.23.1 for vr11 targets

This uses version 4.23.1 of the dsl_cpe_control package from the Intel
UGW 8.5.2.10 for the VRX518.

Signed-off-by: Martin Schiller <ms.3headeddevs@gmail.com>
[rebased]
Signed-off-by: Jan Hoffmann <jan@3e8.eu>
[update to 4.23.1, added Jan's vector mac patch, fix warnings,
 switch to tag tarball]
Signed-off-by: Andre Heider <a.heider@gmail.com>
[add missing nLine in autoboot script, fix disconnect on termination,
 remove unneeded VR9 leftovers in init script]
Signed-off-by: Jan Hoffmann <jan@3e8.eu>
Signed-off-by: Andre Heider <a.heider@gmail.com>