Merge "Revert "Revert "libbinder: Flush excess refs after single async...

Merge "Revert "Revert "libbinder: Flush excess refs after single async transaction""" am: cabecdc6 am: dd051f64

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2455762



Change-Id: Ifdda6544ba739a97e96cf342d3523091edefcc7f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>