Restrict permission on mirror core package am: 7b76fb7761

Original change: https://android-review.googlesource.com/c/platform/tools/tradefederation/contrib/+/2118005

Change-Id: I008b45a4a6b57be05190c388128032472ed7b14f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>