drm/i915: Disable hotplug detection handlers during driver init/shutdown

drm/i915: Disable hotplug detection handlers during driver init/shutdown

As described in the previous two patches an unexpected connector
detection can happen during the init/shutdown sequences. Prevent these
by returning the connector's current status from the detection handlers.

Link: https://patchwork.freedesktop.org/patch/msgid/20240104083008.2715733-10-imre.deak@intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>