BtAudio: Prevent unlink dead binder

Tag: #stability
Bug: 227029886
Test: manually kill bt process
Change-Id: Ic976a33feb5a3636ab828637faf0ba109f5948ce
diff --git a/bluetooth/audio/aidl/default/BluetoothAudioProvider.h b/bluetooth/audio/aidl/default/BluetoothAudioProvider.h
index a9f830a..dbfff7d 100644
--- a/bluetooth/audio/aidl/default/BluetoothAudioProvider.h
+++ b/bluetooth/audio/aidl/default/BluetoothAudioProvider.h
@@ -62,6 +62,7 @@
   std::unique_ptr<AudioConfiguration> audio_config_ = nullptr;
   SessionType session_type_;
   std::vector<LatencyMode> latency_modes_;
+  bool is_binder_died = false;
 };
 
 }  // namespace audio