[Bug 758085] v4l2: Track /dev/video* to triggered required probe

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758085

--- Comment #10 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Another important point to remember, the device numbers are not guaranteed by
the linux kernel. Also, distribution might at some point enable such feature in
their kernel, hence we need a scan to see the devices. And further update to
the kernel could change the device order, resulting in bad cached value.

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