Add a tee sink filename suffix to distinguish type

Test: tee sink filenames have a _C (capture), _P (playback), or _T (track) suffix
Change-Id: Ib8ddadb0f3e3ba3ac620e33072bb212d5cde4978
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 2234f73..5cdabbc 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -4751,7 +4751,7 @@
 
 #ifdef TEE_SINK
     // Write the tee output to a .wav file
-    dumpTee(fd, mTeeSource, mId);
+    dumpTee(fd, mTeeSource, mId, 'M');
 #endif
 
 }