Merge "[DO NOT MERGE]Revert "Relax minimum signature scheme version for apps...

Merge "[DO NOT MERGE]Revert "Relax minimum signature scheme version for apps on system partition"" into sc-v2-dev am: 70260553

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16943318

Change-Id: Id1d3ebadd53f391268183ce27f57216e045134c3