drm/rockchip: Fix shutdown when no drm-device is set up

When the drm-driver probes, it mainly creates the component device, where
all the sub-drivers (vops, hdmi, etc) hook into.

This will cause the shutdown handler to get called on shutdown, even
though the drm-device might not have been set up, or the component bind
might have failed.

So use the new component helper to check whether the drm-device is up
and only then call the drm-atomic helper to release all the drm magic.

This prevents failures when the drm-device is never set, or has been
freed up already for example by a probe-defer during the component bind.

Reviewed-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20250220234141.2788785-3-heiko@sntech.de

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