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Unlike what can be found for other entities, there's no DRM-managed
function to create a panel_bridge instance from a panel.

Let's introduce one.
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/20220711173939.1132294-11-maxime@cerno.tech