IAudioFlinger::openRecord track_flags_t flags is in/out

This will allow AudioFlinger to tell client it is denying a request.

Change-Id: Iff2be3ad6636371bbda9c9899a283c94620c1f06
diff --git a/include/media/IAudioFlinger.h b/include/media/IAudioFlinger.h
index 82aae62..49f921b 100644
--- a/include/media/IAudioFlinger.h
+++ b/include/media/IAudioFlinger.h
@@ -79,7 +79,7 @@
                                 audio_format_t format,
                                 audio_channel_mask_t channelMask,
                                 size_t frameCount,
-                                track_flags_t flags,
+                                track_flags_t *flags,
                                 pid_t tid,  // -1 means unused, otherwise must be valid non-0
                                 int *sessionId,
                                 status_t *status) = 0;