Fix v4l2src io-mode

With glbox fixed, v4l2src doesn't require to be run with userptr mode.

Change-Id: Ie191e4091d7ad576aad41694f6cf9443624032ca
diff --git a/edgetpuvision/pipelines.py b/edgetpuvision/pipelines.py
index 950441e..6646b8e 100644
--- a/edgetpuvision/pipelines.py
+++ b/edgetpuvision/pipelines.py
@@ -35,8 +35,7 @@
 
 def v4l2_src(fmt, render_size):
     return [
-        #TOOD: Use Source until dmabuf in v4l2src -> glupload is fixed.
-        Filter('v4l2src device=%s io-mode=userptr' % fmt.device),
+        Source('v4l2', device=fmt.device),
         Caps('video/x-raw', format=fmt.pixel, width=fmt.size.width, height=fmt.size.height,
              framerate='%d/%d' % fmt.framerate),
         Filter('glfilterbin filter=glbox'),