drm/vc4: crtc: Switch to DRM-managed CRTC initialization

The current code will call drm_crtc_cleanup() when the device is
unbound. However, by then, there might still be some references held to
that CRTC, including by the userspace that might still have the DRM
device open.

Let's switch to a DRM-managed initialization to clean up after ourselves
only once the DRM device has been last closed.

Acked-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Dave Stevenson <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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