Remove PCM16 assumption from FastCapture

Bug: 19586911
Change-Id: I74d4ddc09a9eb9c651f874482639d39a56f8ca1f
diff --git a/services/audioflinger/FastCapture.h b/services/audioflinger/FastCapture.h
index eec89c9..e258a4d 100644
--- a/services/audioflinger/FastCapture.h
+++ b/services/audioflinger/FastCapture.h
@@ -54,7 +54,7 @@
     int                 mInputSourceGen;
     NBAIO_Sink*         mPipeSink;
     int                 mPipeSinkGen;
-    short*              mReadBuffer;
+    void*               mReadBuffer;
     ssize_t             mReadBufferState;   // number of initialized frames in readBuffer,
                                             // or -1 to clear
     NBAIO_Format        mFormat;