Revert^2 "Reapply "AudioFlinger: Control volume using Port ID""

This reverts commit d3e99d20da87b3a8f0bae64e16f916c0fde85098.

Reason for revert: Internal project fixed with ag/28965993

Test: Treehugger
Bug: 361842578
Change-Id: I76427c29383fa1676de2c3635803a4f16ad9d552
diff --git a/services/audioflinger/TrackBase.h b/services/audioflinger/TrackBase.h
index a0b85f7..1342b7b 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;
-    const audio_attributes_t mAttr;
+    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;