[Bug 768195] v4l2: Add support for device capability

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768195

--- Comment #13 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 331174
  --> https://bugzilla.gnome.org/attachment.cgi?id=331174&action=edit
v4l2: Also copy device_caps in gst_v4l2_dup

This fixes regression where M2M error out saying they have no output
format (the V4L2 CAPTURE side).

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