netifd: enable coredumps again

got broken due procd startup. Requires procd resource limit patch.

Signed-off-by: Ulrich Weber <uw@xyne.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39020 3c298f89-4303-0410-b956-a3cf2f4a3e73