CHROMIUM: config: Disable netlink (userspace) conntrack helpers for ipq806x

This setting may impact throughput, so turn it off for now.  Leave it
enabled on Chromebooks.

BUG=b:29551145
TEST=buildbots

Change-Id: If490607bee31fe895b7bf3b1c3abc147746f8e23
Signed-off-by: Kevin Cernekee <cernekee@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/454239
Reviewed-by: Hisham Yehia <hyehia@google.com>
Reviewed-by: Kan Yan <kyan@google.com>
Commit-Queue: Kan Yan <kyan@google.com>
Tested-by: Kan Yan <kyan@google.com>
9 files changed