update for new audio.h header location

Change-Id: Ic4c62c4037800802427eb7d3c7f5eb8b25d18876
Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index e08a55b..8a180d8 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -23,7 +23,7 @@
 #include <media/IAudioPolicyService.h>
 #include <math.h>
 
-#include <hardware/audio.h>
+#include <system/audio.h>
 
 // ----------------------------------------------------------------------------
 // the sim build doesn't have gettid