audio: rename virtualizer stage to spatializer

Use audio spatializer and spatialization instead of
virtualizer stage to reflect the name chosen for public APIs.

Bug: 188502620
Test: make
Change-Id: I7974c5b159722efd795e0b0b79ddbb0658c52034
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 17ecf21..a77a27d 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -2569,10 +2569,10 @@
             return thread;
         } else {
             sp<PlaybackThread> thread;
-            //TODO: b/193496180 use virtualizer stage flag at audio HAL when available
+            //TODO: b/193496180 use spatializer flag at audio HAL when available
             if (flags == (audio_output_flags_t)(AUDIO_OUTPUT_FLAG_FAST
                                                     | AUDIO_OUTPUT_FLAG_DEEP_BUFFER)) {
-                thread = new VirtualizerStageThread(this, outputStream, *output,
+                thread = new SpatializerThread(this, outputStream, *output,
                                                     mSystemReady, mixerConfig);
                 ALOGD("openOutput_l() created virtualizer output: ID %d thread %p",
                       *output, thread.get());
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index d3cae76..1d9f82c 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -7064,7 +7064,7 @@
 
 // ----------------------------------------------------------------------------
 
-AudioFlinger::VirtualizerStageThread::VirtualizerStageThread(const sp<AudioFlinger>& audioFlinger,
+AudioFlinger::SpatializerThread::SpatializerThread(const sp<AudioFlinger>& audioFlinger,
                                                              AudioStreamOut* output,
                                                              audio_io_handle_t id,
                                                              bool systemReady,
@@ -7073,7 +7073,7 @@
 {
 }
 
-void AudioFlinger::VirtualizerStageThread::checkOutputStageEffects()
+void AudioFlinger::SpatializerThread::checkOutputStageEffects()
 {
     bool hasVirtualizer = false;
     bool hasDownMixer = false;
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index b9801c2..33a83e1 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -1658,14 +1658,14 @@
     }
 };
 
-class VirtualizerStageThread : public MixerThread {
+class SpatializerThread : public MixerThread {
 public:
-    VirtualizerStageThread(const sp<AudioFlinger>& audioFlinger,
+    SpatializerThread(const sp<AudioFlinger>& audioFlinger,
                            AudioStreamOut* output,
                            audio_io_handle_t id,
                            bool systemReady,
                            audio_config_base_t *mixerConfig);
-            ~VirtualizerStageThread() override {}
+            ~SpatializerThread() override {}
 
             bool hasFastMixer() const override { return false; }