TIF: Remove TvInputManager.Session from system API

Originally this API is expected to be used some use cases which don't
fit TvView well. e.g. background recording. Removing this from system api
in favor of TvRecodingClient which is introduced in N.

Bug: 25726241
Change-Id: If45fc3e2c5382e7b9e8abf42effebd76fd84b25d
2 files changed