gst: disable non 8bit bayer formats.
gst: disable non 8bit bayer formats.

They are not supported by gstreamer.
See https://bugzilla.gnome.org/show_bug.cgi?id=693666 .

AravisProject/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,AravisProject/aravis,AravisProject/aravis,AravisProject/aravis,AravisProject/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis,AnilRamachandran/aravis