AudioFlinger: Split off audio processing library

Test: native AudioResampler test, general playback test
Bug: 31015569
Change-Id: Ifb248f4402a583438d756c014dcd7a4577aef713
diff --git a/services/audioflinger/FastMixer.cpp b/services/audioflinger/FastMixer.cpp
index 93f7ce5..7182f32 100644
--- a/services/audioflinger/FastMixer.cpp
+++ b/services/audioflinger/FastMixer.cpp
@@ -39,7 +39,7 @@
 #endif
 #include <audio_utils/conversion.h>
 #include <audio_utils/format.h>
-#include "AudioMixer.h"
+#include <media/AudioMixer.h>
 #include "FastMixer.h"
 
 namespace android {