Populates Launcher's SurfaceView with SysUI's Smartspace.

For now just inflates a second copy with no fancy handoff
(technically or visually). Eventually this logic will be
part of the shared SmartspaceView and accompanying API.

Test: Manually with the necessary Launcher flag enabled/disabled.
Bug: 141701658
Change-Id: I94bb7f9ba1f9e72e48e9681437a76b5d59bb0795