Fix androidcamera for Nexus 5

Looks like the camera HAL for Nexus 5 doesn't like it when BufferQueue consumer usage bits are left to 0. This patch fixes the native-activity sample for me on Nexus 5 Android 4.4.2. It is probably the cause of this issue: http://answers.opencv.org/question/30311/opencv_nativecamera-startpreview-fails-on-nexus-5/