Allow for each lantiq target (without wifi eeprom) to define where
wireless configuration data is on flash. Patch also adds support for
sx763 lantiq target.
Signed-off-by: Luka Perkov <openwrt@lukaperkov.net>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27662 3c298f89-4303-0410-b956-a3cf2f4a3e73