Add DiagnosticsTool domain for SELinux access. am: 6498d1c798

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

Change-Id: Ic64f86714623f128a8949bff5efb6b8be0a6716d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>