Merge "Changes ENABLE_SMARTSPACE_ENHANCED to be a DeviceFlag." into sc-dev am: 39ba7604b0

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13680611

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia4198878bc78f0c3b2309fb3b4a83241401c8d92