Add tee sink to SpdifStreamOut

Test: enable per https://source.android.com/docs/core/audio/debugging
      play ac3 track via SpdifStreamOut using
      AudioTrackSurroundTest#testPlayAC3Bytes
      dumpsys media.audio_flinger and see .raw iec61937 wrapped
      file in /data/misc/audioserver.
Change-Id: I65ccd9d8a5b92ef7ffc87e081095d8f7332d8acb
diff --git a/services/audioflinger/datapath/SpdifStreamOut.h b/services/audioflinger/datapath/SpdifStreamOut.h
index c8dc89f..1640575 100644
--- a/services/audioflinger/datapath/SpdifStreamOut.h
+++ b/services/audioflinger/datapath/SpdifStreamOut.h
@@ -25,6 +25,7 @@
 
 #include "AudioStreamOut.h"
 
+#include <afutils/NBAIO_Tee.h>
 #include <audio_utils/spdif/SPDIFEncoder.h>
 
 namespace android {
@@ -116,6 +117,10 @@
     ssize_t  writeDataBurst(const void* data, size_t bytes);
     ssize_t  writeInternal(const void* buffer, size_t bytes);
 
+#ifdef TEE_SINK
+    NBAIO_Tee mTee;
+#endif
+
 };
 
 } // namespace android