Revert^3 "Reapply "AudioFlinger: Control volume using Port ID""

This reverts commit 98c44f36c95fd01ffc6f44b894e41c3140b9ed7e.

Reason for revert: Potential culprit for b/362363068- verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: Ic97eda49fbcccc6e47357d17a552d24960a1a393
diff --git a/services/audioflinger/TrackBase.h b/services/audioflinger/TrackBase.h
index 1342b7b..a0b85f7 100644
--- a/services/audioflinger/TrackBase.h
+++ b/services/audioflinger/TrackBase.h
@@ -347,7 +347,7 @@
     size_t              mBufferSize; // size of mBuffer in bytes
     // we don't really need a lock for these
     MirroredVariable<track_state>  mState;
-    audio_attributes_t  mAttr;
+    const audio_attributes_t mAttr;
     const uint32_t      mSampleRate;    // initial sample rate only; for tracks which
                         // support dynamic rates, the current value is in control block
     const audio_format_t mFormat;