Pull up mFlags and isFastTrack from Track to TrackBase

Change-Id: I6bd48292310be4e05758a11f617f50585904422d
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 470b018..91d63e7 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -5154,7 +5154,7 @@
 
         track = new RecordTrack(this, client, sampleRate,
                       format, channelMask, frameCount, sessionId, uid,
-                      (*flags & IAudioFlinger::TRACK_FAST) != 0);
+                      *flags);
 
         lStatus = track->initCheck();
         if (lStatus != NO_ERROR) {