[Bug 784908] v4l2videodec: Implement stable naming scheme for elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784908

--- Comment #10 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 355536
  --> https://bugzilla.gnome.org/attachment.cgi?id=355536&action=edit
v4l2videodec: Implement stable element names

Before that, each m2m node would be wrapped as a single, multi-format
decoder element. As a unique name was needed, we where using the device
name, which changes between re-boots. This led to unpredictable element
names. In this patch, we generate an element per codec, using
v4l2<codec>dec name. If for some reason there is multiple decoder for
the same format, the following elements will be named
v4l2<codec><node>dec.

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