Merge "Remove sub-includes from libcutils/threads.h" into main am: a981d589...

Merge "Remove sub-includes from libcutils/threads.h" into main am: a981d589 am: bf51390a am: 40cff3af

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2675702



Change-Id: I0f14ca612517ead6dfa715c47a25ed78c2dd7ba0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>