[Bug 746080] v4l2: enumerate output ports and add a property to select input/output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746080

--- Comment #1 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 299170
  --> https://bugzilla.gnome.org/attachment.cgi?id=299170&action=edit
v4l2_calls: add support of video output enumeration

Like for capture device, an output device can have multiple outputs.
This commit add two helpers to enumerate input/output and use one of them
according to device type to fill corresponding structure the same way it was
originaly done with input.

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