lantiq: move 01_led_migration script to subtargets

Split the /etc/uci-defaults/01_led_migration scripts into subtargets
as already done for most of the other base-files.

While this introduces a minor amount of code duplication, it still
is considered an improvement, as device-specific settings are kept
together in the subtargets' base-files and the script at hand can be
removed entirely for two of the subtargets not needing it.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/lantiq/base-files/etc/uci-defaults/01_led_migration

@@ -1,42 +0,0 @@
-#
-# Copyright (C) 2013 OpenWrt.org
-#
-
-. /lib/functions/migrations.sh
-
-do_internet_led_rename()
-{
-	config_load system
-
-	[ -n $(config_get led_internet name) ] || return
-	[ -z $(config_get led_dsl name) ] || return
-
-	uci rename system.led_internet=led_dsl
-	uci set system.led_dsl.name=dsl
-
-	logger -t led-migration "internet led renamed to dsl"
-}
-
-case "$(board_name)" in
-alphanetworks,asl56026|\
-arcadyan,arv452cqw|\
-arcadyan,arv7510pw22|\
-arcadyan,arv7519rw22|\
-arcadyan,arv752dpw|\
-arcadyan,arv752dpw22|\
-arcadyan,vg3503j|\
-avm,fritz7360sl|\
-bt,homehub-v2b|\
-bt,homehub-v3a|\
-bt,homehub-v5a)
-	do_internet_led_rename
-	;;
-netgear,dgn3500|\
-netgear,dgn3500b)
-	migrate_leds "dgn3500:blue:wireless=dgn3500:green:wireless"
-	;;
-esac
-
-migrations_apply system
-
-exit 0