Rename AudioState to CallAudioState

Deprecate AudioState class and make methods @SystemApi where
necessary to minimize impact to SystemApi
Replace usages of AudioState inside Telecom sub-systems
Fire both onCallAudioStateChanged and onAudioStateChanged callbacks
for backward compatibility
Support both setAudioState and setCallAudioState for all classes

Bug: 21040387
Bug: 21088300
Change-Id: I3ec7b3afdaa344c6d639d1c421f1842d67f7d0f7

telecomm/java/android/telecom/InCallAdapter.java

@@ -119,7 +119,7 @@ public final class InCallAdapter {
     }
 
     /**
-     * Sets the audio route (speaker, bluetooth, etc...). See {@link AudioState}.
+     * Sets the audio route (speaker, bluetooth, etc...). See {@link CallAudioState}.
      *
      * @param route The audio route to use.
      */