Allow items to be added alongside smartspace

- Allow icons to be added to first row where search container does not occupy
- On upgrade, clean up first row of screen 0 which may have junk data, as we used to assume first forw of screen 0 is always occupied

Bug: 210127246
Test: manual
Change-Id: I835a321964984e02632c8a70474a6551b5e360f7