[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 #11 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-03-08 14:25:57 UTC ---
I'd prefer if we would not allow even more liberal versions of the strings :)
But a warning seems ok, if someone ignores these warnings then that's not our
problem.

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