Enable selinux on all boards

This enable selinux on all boards. Currently, selinux is only enabled on
the internal builds. This also turns on the flag on the public builds.

BUG=b:241716898, chromium:1350098
TEST=CQ
TEST=full tryjob which runs public builds

Change-Id: Id8699daad276af591c049ae825eda6cafe382e56
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/3817629
Tested-by: Chung-Sheng Wu <chungsheng@google.com>
Commit-Queue: Chung-Sheng Wu <chungsheng@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
3 files changed