Merge "Add armv9-a arch variant." am: e497e7df am: fd3a7181 am: cc0527f1

Original change: https://android-review.googlesource.com/c/platform/build/+/2471731



Change-Id: Ifba76a2c7bea8f688db5c6c86709cee6f1a770db
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>