plugin: Allow device nodes as dependency
plugin: Allow device nodes as dependency

This is useful for feature that are produced after probing a specific
node. You want to reload this plugin if the specific node(s) have been
removed, added, or reloaded.

https://bugzilla.gnome.org/show_bug.cgi?id=758080

StreamUtils/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpxiong/gstreamer,centricular/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,centricular/gstreamer,jpxiong/gstreamer