dsl-qos-queue: remove from /packages

No longer functional (libipq is no longer supported), and abandoned by
upstream as well.

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

git-svn-id: svn://svn.openwrt.org/openwrt@37494 3c298f89-4303-0410-b956-a3cf2f4a3e73