Subsume prebuilt_etc through prebuilt_file usage am: 3dc924bdb4 am: 6234e86c39 am: a4ecd7a1d0 am: c7d5439fbb am: da779c2971 Original change: https://android-review.googlesource.com/c/platform/build/bazel/+/1980706 Change-Id: Iceb6d053350e286071490ca36c408909b13086ca Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>