[RESTRICT AUTOMERGE][pm] prevent system app downgrades of versions lower than...

[RESTRICT AUTOMERGE][pm] prevent system app downgrades of versions lower than preload am: 224da6d4 am: d9092a87 am: c3e8603a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21159679



Change-Id: I2344a74263d04a4b0564f001021d6654819e1f4f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>