linux-atm: create atm-debug-tools package

Instead of commenting the inclusion of some binaries, just make them
available using a new package "atm-debug-tools."

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34477 3c298f89-4303-0410-b956-a3cf2f4a3e73