v4l2: Remove last include to linux/videodev2.h
v4l2: Remove last include to linux/videodev2.h

We now use and update our internal copy so we no longer have to ifdef
the entire code for features and defines that where added over the
years.

https://bugzilla.gnome.org/show_bug.cgi?id=740905

wkatsak/gst-plugins-good,jpakkane/gstreamer-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good,wkatsak/gst-plugins-good,wkatsak/gst-plugins-good,jpakkane/gstreamer-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good,jpakkane/gstreamer-plugins-good,jpakkane/gstreamer-plugins-good,wkatsak/gst-plugins-good,ndufresne/gst-plugins-good,ndufresne/gst-plugins-good,ndufresne/gst-plugins-good,ndufresne/gst-plugins-good