Fix type of AudioTrack/AudioRecord parameter frameCount

It's size_t consistently

Change-Id: I29638ef59ac773218025f2403a3508a307b487e0
diff --git a/media/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index 142788d..200c561 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -1455,7 +1455,7 @@
                 format, bufferCount, mSessionId, flags);
     uint32_t afSampleRate;
     size_t afFrameCount;
-    uint32_t frameCount;
+    size_t frameCount;
 
     // offloading is only supported in callback mode for now.
     // offloadInfo must be present if offload flag is set