Revert "Remove lights wrapper"

This reverts commit e31f7f6030bbe8a67ce379afb649f9328644f5ac.
Make lights wrapper opt-in

* Don't build in by default.
* Plan is to switch all devices to an open HAL eventually,
  but until that is done, this can stay while we move
  devices, starting with 8974s.

Change-Id: I9c198714c5cb438f4dc8a7f78c47947aa1769ad6