TIF: Add a way to notify whether the current program content is allowed

Now we have a complete set of API to tell the entire cases (allowed and
blocked), which makes possible for the application to rely more on
actions taken by TV input services transferring the responsibility for
parental control.

Bug: 13172379
Change-Id: I7b0dcf16b870782c76a428a1dac6ef1a528b7d40