Merge "Revert "Revert "Remove cutils threads.h header completely.""" into main am: c05fd258ee

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2713394

Change-Id: I14eeb6ae7d08d474bc1c55b09354f3ef3e79f0e8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>