iptables: Add missing IPv6 builtin modules

git-svn-id: svn://svn.openwrt.org/openwrt@35898 3c298f89-4303-0410-b956-a3cf2f4a3e73
netfilter: Fix typo in last commit

git-svn-id: svn://svn.openwrt.org/openwrt@35899 3c298f89-4303-0410-b956-a3cf2f4a3e73