[Bug 794216] New: allocators: Add DMABuf synchronization

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794216

            Bug ID: 794216
           Summary: allocators: Add DMABuf synchronization
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

See commit message, this hint the drivers whenever CPU access is done.
This fixes notably visible artifact seen with the following pipeline
using an UVC camera:

  v4l2src ! videoconvert ! video/x-raw,format=RGBA ! kmssink

Though it does not fix the trully zero-copy path with UVC because of a driver
bug.

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