Add DiagnosticsTool domain for SELinux access. am: 6498d1c798 am: 0884688dc1

Original change: https://googleplex-android-review.googlesource.com/c/device/google/gs-common/+/25240609

Change-Id: Ib5e9814b0e843d6393b300827fe85d4cd7f2c1fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>