Merge "Reduce flake in pthread mutex timed lock tests." into main am: 8fbe373e7a

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3341835

Change-Id: I5532dd8bae84c6acab99d831c91839002ae30ec4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>