vendor: ensure all non-treble devices get same access to /vendor

Make sure vendor_file is added everywhere system_file access is granted
to vendor processes. This guarantees non-treble device policy is not
altered (made stricter) in any way after the relabeling.

Bug: 36527360

All test were run on Bullhead.
Test: Boot and connect to wifi
Test: Run chrome and load websites, play video in youtube, load maps w/
      current location, take pictures and record video in camera,
      playback recorded video.
Test: Connect to BT headset and ensure audio plays back.
Test: OTA sideload using recovery
Test: CTS SELinuxHostTest pass

Change-Id: I5a28c4a6da2296db312e30686c07e3d27e8963da
Signed-off-by: Sandeep Patil <sspatil@google.com>
3 files changed