enable ip6table_mangle as module

Enabled ip6table_mangle to enable IPv6 support in Cilium

BUG=b/184087614
TEST=Presubmit, checked module loads in image
RELEASE_NOTE=Enabled CONFIG_IP6_NF_MANGLE to allow ip6table_mangle kernel module

Change-Id: If9322ee62cf32181f1e5ae3ffea326b3cca742a5
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/15070
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Roy Yang <royyang@google.com>
3 files changed