nf-nathelper-extra and nf-conntrack-netlink had iptables related
dependencies, yet, when looking for the respective kernel symbols and
checking it's dependencies it was confirmed that iptables wasn't
required and that these were either it's own moodule or tool independent
(nftables or iptables).
Correct these and make sure no unneeded extras are pulled in.
Signed-off-by: Tiago Gaspar <tiagogaspar8@gmail.com>