Adapter logic for adding call context to call card fragment.

+ Adapter for call context list view
+ Method in CallCardFragment that handles properly displaying the call
  context information
+ Strings for the call context title
Note: the setCallContext method is currently not being called anywhere.
It is anticipated to be called in CallCardPresenter after the
appropriate data is loaded.

Bug: 23351559
Change-Id: Id72390fc9d2a8794b88ab72661381eb96596d619