Merge "libbinder_rs: Use a bindgen flag file" into main am: 8905bf69d9

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2650996

Change-Id: Ifadb926de43712d2ed66846e94f545717c911f1c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>