TIF: Merge TvParentalControlManager into TvInputManager

This change addresses the following API council feedback.

TvParentalControlManager:
-- Replace the listener interface with a broadcast Intent with well-known
   action, something like ACTION_BLOCKED_RATINGS_CHANGED.
-- TvParentalControlManager goes away, and two remaining methods move to
   TvInputManager.

== Implementation changes ==
-- The user-selected rating preferences should be stored in an XML file, and
   loaded at boot by your internal system service.  It should _not_ be stored in
   a Secure/Global setting.

Bug: 16542165
Change-Id: I278df963576652ec9163a66c1ef99419fcdb36c2