drm-misc-fixes for v4.19-rc5:

- Fix crash in vgem in drm_drv_uses_atomic_modeset.
- Allow atomic drivers that don't set DRIVER_ATOMIC to create debugfs entries.
- Fix compiler warning for unused connector_funcs.
- Fix null pointer deref on UDL unplug.
- Disable DRM support for sun4i's R40 for now.
  (Not all patches went in for v4.19, so it has to wait a cycle.)
- NULL-terminate the of_device_id table in pl111.
- Make sure vc4 NV12 planar format works when displaying an unscaled fb.
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