Remove dependencies on hardware/audio_effects.h and EffectsFactoryApi.h

Also remove some outstanding dependencies on hardware/audio.h.

Most of the time, only constants and structs from audio_effects.h
are used, and no actual calls into HAL are made. Move these
definitions into system/audio_effect.h, and generate constants
from TREBLE HAL definition.

For parameters, always use values from AudioParameter class.

There are still some outstanding includes of hardware/audio.h
in code that directly deals with audio modules. Need to extend
libaudiohal interfaces to support required functionality.

Test: make

Change-Id: I0bcdf8ae199485d4d65f3eeb7e7a3b9b5cdb6ab6
diff --git a/include/media/AudioParameter.h b/include/media/AudioParameter.h
index 891bc4b..99e2a6d 100644
--- a/include/media/AudioParameter.h
+++ b/include/media/AudioParameter.h
@@ -49,6 +49,18 @@
     static const char * const keyInputSource;
     static const char * const keyScreenState;
 
+    //  keyBtNrec: BT SCO Noise Reduction + Echo Cancellation parameters
+    //  keyHwAvSync: get HW synchronization source identifier from a device
+    //  keyMonoOutput: Enable mono audio playback
+    //  keyStreamHwAvSync: set HW synchronization source identifier on a stream
+    static const char * const keyBtNrec;
+    static const char * const keyHwAvSync;
+    static const char * const keyMonoOutput;
+    static const char * const keyStreamHwAvSync;
+
+    static const char * const valueOn;
+    static const char * const valueOff;
+
     String8 toString();
 
     status_t add(const String8& key, const String8& value);