Merge branch 'drm/next/du' of git://linuxtv.org/pinchartl/media into drm-next

The series interleaves DRM and V4L2 patches due to dependencies between the R-
Car DU and VSP drivers. Mauro has acked all the V4L2 patches to go through
your tree, and they don't conflict with anything queued for v4.13 in his tree.
If I need to send any conflicting patches through Mauro's tree for v4.13, I'll
make sure to base them on this branch.

* 'drm/next/du' of git://linuxtv.org/pinchartl/media:
  drm: rcar-du: Map memory through the VSP device
  v4l: vsp1: Add API to map and unmap DRM buffers through the VSP
  v4l: vsp1: Map the DL and video buffers through the proper bus master
  v4l: rcar-fcp: Add an API to retrieve the FCP device
  v4l: rcar-fcp: Don't get/put module reference
  drm: rcar-du: Register a completion callback with VSP1
  v4l: vsp1: Extend VSP1 module API to allow DRM callbacks
  v4l: vsp1: Postpone frame end handling in event of display list race
  drm: rcar-du: Arm the page flip event after queuing the page flip