Separate MediaRecorderClient with MediaPlayerClient

- An alternative would be to define a common base class that
  both MediaRecorderClient and MediaPlayerClient can derive.
  But since the common code, onTransact() and notify() uses
  some Binder code, having a common base class may not gain
  us too much in terms of code reuse.

Change-Id: Ibc06720278ad173fceacff3d267b7060856c6316
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index 7908f5d..de9e51d 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -12,6 +12,7 @@
     mediaplayer.cpp \
     IMediaPlayerService.cpp \
     IMediaPlayerClient.cpp \
+    IMediaRecorderClient.cpp \
     IMediaPlayer.cpp \
     IMediaRecorder.cpp \
     Metadata.cpp \