Camera1: Set preview to be asynchronous, and remove dead code

- Use the controlledByApp flag to make sure application-bound
  preview buffer queue is asynchronous as before
- Remove setPreviewDisplay in service, since it is no longer in
  the binder interface
- Rename setPreviewTexture to setPreviewTarget, to make it clear it's
  the only game in town now. Rename only on the binder level and service
  for now.

Bug: 10312644
Change-Id: Icd33a462022f9729a63dc65c69b755cb7969857e