[automerger skipped] Merge "Verify mPollThread is joinable before detaching" into android10-tests-dev am: ebb71b593b -s ours am: 9423964fed -s ours

am skip reason: Change-Id Ie685ae2dc314edb8df2f3cc7112141a2f5e46008 with SHA-1 65945cfb15 is in history

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1167936

Change-Id: I3f6c1cb637ec180c0110a4f31e27d00adb0ddd9a