lantiq: cleanup default package selection

target/linux/lantiq/ar9/profiles/000-generic.mk

target/linux/lantiq/ar9/profiles/001-lantiq.mk

target/linux/lantiq/ar9/profiles/002-netgear.mk

target/linux/lantiq/ar9/profiles/003-buffalo.mk

target/linux/lantiq/ar9/target.mk

target/linux/lantiq/danube/profiles/000-generic.mk

target/linux/lantiq/danube/profiles/001-lantiq.mk

target/linux/lantiq/danube/profiles/002-arcadyan.mk

target/linux/lantiq/danube/profiles/003-gigaset.mk

target/linux/lantiq/danube/target.mk