[Bug 742917] v4l2: Allow scaling in the v4l2*convert element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742917

--- Comment #7 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
The problem is that we need to only suggest things that are possible in our
transform caps call. Failing trying to do something that is not supported is
not acceptable. There could be an element downstream the do scale correctly.

If V4L2 don't tell us that, we should at least create a white list.

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