lantiq: board.d: use auto xfer_mode as default

If xfer_mode is set to auto the vdsl_cpe_control daemon assumes that
ATM should be used for ADSL and PTM for VDSL.

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

target/linux/lantiq/base-files/etc/board.d/02_network

@@ -12,6 +12,8 @@ board_config_update
 vpi=1
 vci=32
 annex="a"
+tone="av"
+xfer_mode=""
 encaps="llc"
 payload="bridged"
 lan_mac=""
@@ -198,7 +200,7 @@ ls /lib/modules/$(uname -r)/ltq_atm* 1> /dev/null 2>&1 && \
 
 if lantiq_is_vdsl_system; then
 	interface_wan="ptm0"
-	ucidef_add_vdsl_modem "$annex" "av" "ptm"
+	ucidef_add_vdsl_modem "$annex" "$tone" "$xfer_mode"
 else
 	interface_wan="nas0"
 	ucidef_add_adsl_modem "$annex" "/lib/firmware/adsl.bin"