Stop marking apps as privileged if they are not signed properly. am: 06775341ad am: bcf8db1747

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

Change-Id: I86478b0907167bfa031f4cf6e25afdc0e8bd518c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>