Abstract away access to audio streams HAL in AudioFlinger

In this CL all direct access to audio_stream_t, audio_stream_out_t, and
audio_stream_in_t their functions is encapsulated within the new
hierarchy of Stream[In|Out]HalLocal classes.  AudioFlinger uses
interface classes Stream[In|Out]HalInterface to access these functions.

Note that NBAIO still receives raw HAL stream handles and needs to be
converted separately.

Bug: 30222631
Test: manual with Loopback app

Change-Id: I6388cfa2006791c9c0aa7bb186719209726a2d48
diff --git a/services/audioflinger/EffectsFactoryHalInterface.h b/services/audioflinger/EffectsFactoryHalInterface.h
index a865dd1..9a08f68 100644
--- a/services/audioflinger/EffectsFactoryHalInterface.h
+++ b/services/audioflinger/EffectsFactoryHalInterface.h
@@ -28,8 +28,6 @@
 class EffectsFactoryHalInterface : public RefBase
 {
   public:
-    virtual ~EffectsFactoryHalInterface() {}
-
     // Returns the number of different effects in all loaded libraries.
     virtual status_t queryNumberEffects(uint32_t *pNumEffects) = 0;
 
@@ -57,6 +55,8 @@
   protected:
     // Subclasses can not be constructed directly by clients.
     EffectsFactoryHalInterface() {}
+
+    virtual ~EffectsFactoryHalInterface() {}
 };
 
 } // namespace android