audioflinger: Make use of android-base/macros.h

Replace local definitions of "array size" macro, and
declarations of non-copyable objects with corresponding
constructs from android-base/macros.h.

Also change "protected:" to "private:" for classes
not designed to be inherited.

Change-Id: I2d1e6d153511ed84d52fe6377879f83258890653
Test: make
diff --git a/services/audioflinger/TrackBase.h b/services/audioflinger/TrackBase.h
index e0c09f7..cb540ca 100644
--- a/services/audioflinger/TrackBase.h
+++ b/services/audioflinger/TrackBase.h
@@ -92,8 +92,7 @@
 
 
 protected:
-                        TrackBase(const TrackBase&);
-                        TrackBase& operator = (const TrackBase&);
+    DISALLOW_COPY_AND_ASSIGN(TrackBase);
 
     // AudioBufferProvider interface
     virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer) = 0;