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Unlike other DRM entities, there's no helper to create a DRM-managed
initialisation of a connector.

Let's create an helper to initialise a connector that would be passed as an
argument, and handle the cleanup through a DRM-managed action.
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-10-maxime@cerno.tech