Merge "Add DisplayController in PreviewContext's allowed objects" into tm-dev am: c1ea2da7f3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/18198386

Change-Id: If14bdc8198bfe737e2c8ceff41d590469be75af9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>