Merge "Camera: Use a single handler thread for device state callbacks" into udc-dev am: 5f614202

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21563739



Change-Id: I1b5697f568c223cae89e9c5d6f33f962886f10eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>