cleanup - config_item_ip6()

Test:
  git grep config_item_ip6
  comes up empty

Bug: 144730808
Test: atest clatd_test netd_integration_test
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I0338f7ac29fdb0de56bd4a500e2a827cab2c47f7
1 file changed