AudioFlinger: implement device specific audio effects

Add management of audio effects applied to a specific input
or output audio device.

A new class DeviceEffectProxy derived from Effectbase is added
to represent an effect attached to a particular audio device type and
address. This proxy manages one or more actual EffectModule instances
automatically added to a playback or capture thread or directly to the
audio HAL when the targeted audio device is used by an audio patch.

A new DeviceEffectManager class is added to manage creation and release
of DeviceEffectProxy instances and monitor creation and release of audio
patches and create or release actual effect instances accordingly.

Bug: 136294538
Test: make

Change-Id: I23b9f9db4459136039c5ee327cf3b1aefa7db5af
diff --git a/services/audioflinger/Android.bp b/services/audioflinger/Android.bp
index de8c7e7..c58360d 100644
--- a/services/audioflinger/Android.bp
+++ b/services/audioflinger/Android.bp
@@ -9,6 +9,7 @@
         "AudioStreamOut.cpp",
         "AudioWatchdog.cpp",
         "BufLog.cpp",
+        "DeviceEffectManager.cpp",
         "Effects.cpp",
         "FastCapture.cpp",
         "FastCaptureDumpState.cpp",