Merge "Treat R8 warnings as failures for system_server" am: 1f440e7a62 am: df2014cba1 am: 62fadfafd0 am: d0829e0307

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

Change-Id: Iddc4b108ed4ddb23a0a1d872a0be00ee3caf030b
Signed-off-by: Automerger Merge Worker <[email protected]>