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/EffectHalLocal.h b/services/audioflinger/EffectHalLocal.h
index 92b2153..73ba6d5 100644
--- a/services/audioflinger/EffectHalLocal.h
+++ b/services/audioflinger/EffectHalLocal.h
@@ -24,9 +24,6 @@
 class EffectHalLocal : public EffectHalInterface
 {
   public:
-    // The destructor automatically releases the effect.
-    virtual ~EffectHalLocal();
-
     // Effect process function. Takes input samples as specified
     // in input buffer descriptor and output processed samples as specified
     // in output buffer descriptor.
@@ -43,7 +40,6 @@
     // Returns the effect descriptor.
     virtual status_t getDescriptor(effect_descriptor_t *pDescriptor);
 
-    // FIXME: Remove after converting the main audio HAL
     effect_handle_t handle() const { return mHandle; }
 
   private:
@@ -53,6 +49,9 @@
 
     // Can not be constructed directly by clients.
     explicit EffectHalLocal(effect_handle_t handle);
+
+    // The destructor automatically releases the effect.
+    virtual ~EffectHalLocal();
 };
 
 } // namespace android