Stop marking apps as privileged if they are not signed properly. am: 06775341

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25841331



Change-Id: Ie5043d46ef79a95887423aa44d0f33b5e62c3b61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>