[Bug 725632] v4l2: Normalise control names in the same way as v4l2-ctl

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725632
  GStreamer | gst-plugins-good | 1.2.3

--- Comment #7 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-03-05 01:53:59 UTC ---
Ok, I've stepped back a bit, will poke upstream again, but this may be
considered an ABI change, even though I think it's more correct.

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