Revert "NuPlayer: use kWhatPauseOnBufferingStart instead of kWhatBufferingStart in RTSPSource."

This reverts commit 2c9a30a341e50f53039e1b7da96dfa91104fdd62.
RTSPSource::pause() will stop receiving data in RTSPSource. This is different from GenericSource::pause().

Change-Id: I2df2bf350731ce0fb1f278942b23ccc6f4f37fb9
diff --git a/media/libmediaplayerservice/nuplayer/RTSPSource.cpp b/media/libmediaplayerservice/nuplayer/RTSPSource.cpp
index 2ecab6d..c861fd1 100644
--- a/media/libmediaplayerservice/nuplayer/RTSPSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/RTSPSource.cpp
@@ -725,7 +725,7 @@
         mBuffering = true;
 
         sp<AMessage> notify = dupNotify();
-        notify->setInt32("what", kWhatPauseOnBufferingStart);
+        notify->setInt32("what", kWhatBufferingStart);
         notify->post();
     }
 }
@@ -741,7 +741,7 @@
         mBuffering = false;
 
         sp<AMessage> notify = dupNotify();
-        notify->setInt32("what", kWhatResumeOnBufferingEnd);
+        notify->setInt32("what", kWhatBufferingEnd);
         notify->post();
     }