Port the mechanism for different default configurations from ar71xx and
use the old configuration as the default configuration. This should have
no functional differences to before.
While we are at it, remove the obsolete nat option.
Signed-off-by: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24185 3c298f89-4303-0410-b956-a3cf2f4a3e73
