BufferingSettings: simplify buffering control.

Now only 2 marks, initialMarkMs and resumPlaybackMarkMs, remain.
Test: pass cts tests
Bug: 36280094
Change-Id: I03c8e2a0db9f7e845f57e76f51874cd8715a48d4
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayer.h b/media/libmediaplayerservice/nuplayer/NuPlayer.h
index eefc2a6..747dc47 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayer.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayer.h
@@ -52,7 +52,7 @@
 
     void setDataSourceAsync(const sp<DataSource> &source);
 
-    status_t getDefaultBufferingSettings(BufferingSettings* buffering /* nonnull */);
+    status_t getBufferingSettings(BufferingSettings* buffering /* nonnull */);
     status_t setBufferingSettings(const BufferingSettings& buffering);
 
     void prepareAsync();
@@ -152,7 +152,7 @@
         kWhatGetTrackInfo               = 'gTrI',
         kWhatGetSelectedTrack           = 'gSel',
         kWhatSelectTrack                = 'selT',
-        kWhatGetDefaultBufferingSettings = 'gDBS',
+        kWhatGetBufferingSettings       = 'gBus',
         kWhatSetBufferingSettings       = 'sBuS',
         kWhatPrepareDrm                 = 'pDrm',
         kWhatReleaseDrm                 = 'rDrm',