lantiq: activate noise margin delta for VDSL too

Previously this was only activated for ADSL, this patch activates the
same setting also for VDSL, this feature is also support for VDSL in the
same way it works for ADSL.
I tested it with DSL FW 5.7.9.5.1.7 against a Broadcom 177.140 DSLCO
(Deutsche Telekom) and saw different data rates and Max. Attainable Data
Rates depending on the ds_snr_offset settings I choose.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

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

@@ -109,7 +109,7 @@ locs 0 $1
 }
 
 [Common]={
-}" > /tmp/adsl.scr
+}" > /tmp/dsl.scr
 }
 
 lowlevel_cfg() {
@@ -291,7 +291,7 @@ start_service() {
 	[ -z "${snr}" ] || {
 	    # for SNR offset setting
 	    autoboot_script "$snr"
-	    autoboot="-a /tmp/adsl.scr"
+	    autoboot="-a /tmp/dsl.scr -A /tmp/dsl.scr"
 	}
 
 	procd_open_instance