Merge "binderRpcTest: reduce thread pool saturated flake" am: bc9f2a6cb1

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2566073

Change-Id: Icfb107b8d94aa7cd2d7b9f936b2330a195fd5f60
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>