drm/udl: Implementation of atomic cursor drm_plane

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Subject: drm/udl: Implementation of atomic cursor drm_plane
From: lukasz.spintzyk@xxxxxxxxxxxxx
Date: Mon, 24 Jun 2024 09:10:37 +0200
Cc: Dave Airlie <airlied@xxxxxxxxxx>, Sean Paul <sean@xxxxxxxxxx>, Thomas Zimmermann <tzimmermann@xxxxxxx>

This brings cursor on DisplayLink USB2.0 device on ChromeOS compositor that requires either crtc'c cursor_set callback
or cursor drm_plane. Patch was tested on ChromeOS and Ubuntu 22.04 with Gnome/Wayland

Follow-Ups:
- Re: drm/udl: Implementation of atomic cursor drm_plane
  - From: Thomas Zimmermann
- [PATCH 1/4] drm/udl: Port CrOS cursor blending on primary plane in usb transfer
  - From: lukasz . spintzyk
- [PATCH 4/4] drm/udl: Shutdown all CRTCs on usb disconnect
  - From: lukasz . spintzyk
- [PATCH 3/4] drm/udl: Allow smaller plane sizes to allow cursor plane
  - From: lukasz . spintzyk
- [PATCH 2/4] drm/udl: Add cursor drm_plane support
  - From: lukasz . spintzyk

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