drm-misc-next for v4.18:

UAPI Changes:
- Aspect ratio support for 64:27 and 256:135, usable by atomic clients
  and legacy clients that set DRM_CLIENT_CAP_ASPECT_RATIO.

Core Changes:
- Aspect ratio validation has become more strict.
- A few DP fixes.
- Unneeded stubs from sync_debug interface removed.

Driver Changes:
- Small fixes to xen-front.
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