Updated firewall package and enabling of SYN_COOKIES in 3.2 Kernel

This contains the updated firewall package necessary to resolve the issues with combining port forwarding and IPv6.. this is a reflection of OpenWRT issue documented here: https://dev.openwrt.org/changeset/42610

This also enables SYN_COOKIES in the 3.2 kernel we're currently using, which will address an error being shown during an "fw3 start/stop/reload" and give us TCP SYN cookies going forward.