[ramips] backport esw led switch fix

fixes #12989

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35782 3c298f89-4303-0410-b956-a3cf2f4a3e73
[lantiq] fixes lantiq dsl firmware naming conventions

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35783 3c298f89-4303-0410-b956-a3cf2f4a3e73