Revert "AudioFlinger: Keep track of music effect thread when pri..."

Revert submission 25712917

Reason for revert: Droid-monitor triggered revert likely due to breakage in b/330202134. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:25712917

Change-Id: Iacde14e4dc8c644b55741557bce81101ce2b5f19
diff --git a/services/audioflinger/IAfThread.h b/services/audioflinger/IAfThread.h
index 4b6ab89..d701288 100644
--- a/services/audioflinger/IAfThread.h
+++ b/services/audioflinger/IAfThread.h
@@ -95,8 +95,7 @@
     virtual bool updateOrphanEffectChains(const sp<IAfEffectModule>& effect)
             EXCLUDES_AudioFlinger_Mutex = 0;
     virtual status_t moveEffectChain_ll(audio_session_t sessionId,
-            IAfPlaybackThread* srcThread, IAfPlaybackThread* dstThread,
-            IAfEffectChain* srcChain = nullptr)
+            IAfPlaybackThread* srcThread, IAfPlaybackThread* dstThread)
             REQUIRES(mutex(), audio_utils::ThreadBase_Mutex) = 0;
 
     virtual void requestLogMerge() = 0;