Merge "Add a native UserHalHelper library." am: 82120a8ce4 am: 67a276e764 am: c9a594fc65

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1425310

Change-Id: Idc8205b9d413b273b857fe7c50e4b91b345f0c41