Merge "binder_process.h: clarify thread start behavior" into main am: 0ce759a0 am: 814c887f

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3228527



Change-Id: I63a1c41f0a3d5d6a48cdc4ccebb5479e7e56b833
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>