ltq-vdsl-app: mask out ADSL bits when VDSL is requested

If the line_mode is fixed configured to vdsl, than only G.993 VDSL
should be used.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>

package/network/config/ltq-vdsl-app/files/dsl_control

@@ -211,11 +211,14 @@ start_service() {
 	adsl)
 		mode=1
 
-		# mask out VDSL bits when ATM is requested
+		# mask out VDSL bits when ADSL is requested
 		xtse="${xtse%_*}_00"
 		;;
 	*)
 		mode=2
+
+		# mask out ADSL bits when VDSL is requested
+		xtse="00_00_00_00_00_00_00_${xtse##*_}"
 		;;
 	esac