Merge "Load starlark files from soong" am: 3e0836e8

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



Change-Id: I8581d4388c85a01b9ad6708555e6bb1ab7533fe9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>