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/EffectHalInterface.h b/services/audioflinger/EffectHalInterface.h
index e774520..4bde112 100644
--- a/services/audioflinger/EffectHalInterface.h
+++ b/services/audioflinger/EffectHalInterface.h
@@ -26,9 +26,6 @@
 class EffectHalInterface : public RefBase
 {
   public:
-    // The destructor automatically releases the effect.
-    virtual ~EffectHalInterface() {}
-
     // Effect process function. Takes input samples as specified
     // in input buffer descriptor and output processed samples as specified
     // in output buffer descriptor.
@@ -48,6 +45,9 @@
   protected:
     // Subclasses can not be constructed directly by clients.
     EffectHalInterface() {}
+
+    // The destructor automatically releases the effect.
+    virtual ~EffectHalInterface() {}
 };
 
 } // namespace android