drm: Send per-connector hotplug events

Try to send per-connector hotplug events as often as possible, rather
than connector-less global hotplug events. This does result in more
hotplug events if multiple connectors changed at the same time, but
give userspace more actionable information.

Since the hotplug event needs to be sent outside of the mode_config
mutex to avoid a deadlock, the drm_client_dev_hotplug() call is split
off from the drm_sysfs_(connector_)?hotplug_event calls.

Co-developed-by: Marius Vlad <marius.vlad@collabora.com>
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Link: https://patch.msgid.link/20260526-hot-plug-passup-v10-2-f62351a9ea3e@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>

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