[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

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



Change-Id: Ibdce6507134448d3dc0bb3f86b0f739b3bfb5287
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>