Merge "RAII style wakelocks: Add tryGet() factory method." am: ddff8e6dd0

Original change: https://android-review.googlesource.com/c/platform/hardware/libhardware_legacy/+/1592033

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1d63478a6f2956d687971033621360f2abb3b9d2