Merge "Enable R8 code shrinking for system_server by default" am: 88aaae35

Original change: https://android-review.googlesource.com/c/platform/build/+/2123992



Change-Id: I9e6130964ec9aa40bffe4223ef395624dc54c44b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>