Merge "Merge "Warn for system overlays targeting pre-R" into rvc-dev am: 726f96be am: 08d01263 am: 87db1bfb" into rvc-qpr-dev-plus-aosp am: 0460cb59

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11288146

Change-Id: Ife7e25c570edebe0cadd3b4d854bafcadd8f30be