keernel: Fixed dependencies in netfilter modules introduced with 3.18 kernel

Building current trunk with 3.18 kernel fired some errors like 'missed
dependancy of module XXX from library kmod_YYY.ko'. These patch fixes 3
of such issues which are critical to have a successful build.

Signed-off-by: Alexey N Vinogradov <a.n.vinogradov@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43318 3c298f89-4303-0410-b956-a3cf2f4a3e73