lantiq: fix VDSL device detection with Linux 4.4

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 48319

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

@@ -135,7 +135,7 @@ if [ -n "$(ls /lib/modules/`uname -r`/ltq_atm*)" ]; then
 	ucidef_add_atm_bridge "$vpi" "$vci" "$encaps" "$payload"
 fi
 
-if [ -n "$(grep "system type.*: VR9" /proc/cpuinfo)" ]; then
+if grep -qE "system type.*: (VR9|xRX200)" /proc/cpuinfo; then
 	interface_wan="ptm0"
 	ucidef_add_vdsl_modem "$annex" "/lib/firmware/vdsl.bin" "av" "ptm"
 else