Merge "Revert "Changes ENABLE_SMARTSPACE_ENHANCED to be a DeviceFlag."" into sc-dev am: d6844dcb7f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13700879

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6a2bfabd40a441ee4c442e67bae24f51f86dab99