[automerger skipped] Merge "Disallow system apps to be installed/updated as...

[automerger skipped] Merge "Disallow system apps to be installed/updated as instant." into udc-dev am: 4c390bd2 am: 0ddf73b8 am: 08e094fa am: 1ff30905 -s ours

am skip reason: Merged-In Idd89a6dd72f0e68259095f677185f0494391025c with SHA-1 b978fdc3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25715830



Change-Id: I5b36c86b203d8038797b414b011558dd84d3f152
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>