app/sample: Add stats-test to package am: a64bc52b64

Original change: https://android-review.googlesource.com/c/trusty/app/sample/+/2906761

Change-Id: I1d1cec8e1115051dc0a0f67654f0dad75d993254
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>