lantiq: fix kernel config for DEU support

Trying to load the DEU modules results in unresolved symbols. This
provides them. This requires the previous patch to be applied first.

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37086 3c298f89-4303-0410-b956-a3cf2f4a3e73