Merge "Limit the visibility of libbinder_rpc_unstable" am: e813ec1500 am: a53aeee572

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2442770

Change-Id: I9501acc5c3203498f3bdd5f99c9ebf9aaa34aed0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>