Merge "Revert "Revert "Merge "Restore V2+ signature requirement for system...

Merge "Revert "Revert "Merge "Restore V2+ signature requirement for system apps" into tm-dev am: a347b6c2 am: 8aa6d201""" into tm-d1-dev am: c2da54f2 am: 8bb6ff18 am: 0fec3607

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18409337



Change-Id: Ieea517865608dde777a610284bedd5a8ef666ed9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>