firewall3: use list notation for default zone network config to avoid "uci add_list" coercing the value wrongly

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36806 3c298f89-4303-0410-b956-a3cf2f4a3e73
lantiq: revert [36779] as it caused a regression

submitter was informed of a endinaess swap regression and replied with "works on my board"

revert the patch and make arv7518 wifi work again

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36807 3c298f89-4303-0410-b956-a3cf2f4a3e73