Add uid to audioflinger track dumps

Helpful for debugging app-specific activity.

Test: adb shell dumpsys media.audio_flinger
Flag: EXEMPT logs only
Bug: 372070273
Change-Id: I0d18de57d43b7fdd1bc6d59c40883433490b9650
diff --git a/services/audioflinger/MmapTracks.h b/services/audioflinger/MmapTracks.h
index 8758bd0..442dd80 100644
--- a/services/audioflinger/MmapTracks.h
+++ b/services/audioflinger/MmapTracks.h
@@ -86,6 +86,7 @@
     void onTimestamp(const ExtendedTimestamp &timestamp) final;
 
     const pid_t mPid;
+    const uid_t mUid;
     bool  mSilenced;            // protected by MMapThread::mLock
     bool  mSilencedNotified;    // protected by MMapThread::mLock
 
@@ -99,4 +100,4 @@
     float mVolume = 0.0f;
 };  // end of Track
 
-} // namespace android
\ No newline at end of file
+} // namespace android