Merge "Load starlark files from soong" am: 3e0836e8 am: 145dc54c am: 06260c30

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2424850



Change-Id: I92c152acd86c3be02cb8a3ed1abeffb0291b5c71
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>