camera3: Remove BufferQueue::MIN_UNDEQUEUED_BUFFERS references

Change-Id: I4730ac7849e915e88d3b8fc8aa869f53a8242501
diff --git a/services/camera/libcameraservice/device3/Camera3InputStream.h b/services/camera/libcameraservice/device3/Camera3InputStream.h
index 681d684..ae49467 100644
--- a/services/camera/libcameraservice/device3/Camera3InputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3InputStream.h
@@ -44,6 +44,8 @@
 
     virtual void     dump(int fd, const Vector<String16> &args) const;
 
+    // TODO: expose an interface to get the IGraphicBufferProducer
+
   private:
 
     typedef BufferItemConsumer::BufferItem BufferItem;