TIF: Address the feedback from the API review - 2/3

This change addresses the following comments from the council:
- Change the TvView API to be tune(String inputId, Uri channelUri) and
  reset()
- @hide TvInputSession class, including createSession() and
  SessionCallback
- Define a listener interface specific to TvView, allowing you to hide
  the session details and keep the API simpler.  Add
  setTvInputListener().

Bug: 15345342
Change-Id: I931662841b41d862ebc4a700ccb245889a5f87a5