Merge "Treat R8 warnings as failures for system_server" am: 1f440e7a

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2209838



Change-Id: I288a73a1f5272913a87449513346be44e9af19c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>