Use C++ thread_local rather than libcutils. am: 187cc9f02d am: 33e526d206 am: 45646d5322

Original change: https://android-review.googlesource.com/c/platform/system/libhwbinder/+/1515494

Change-Id: I44778522c3bedc7e7930ed5e6f0e4f58661bfbd6