cxl/port: Cleanup dport removal with a devres group

cxl/port: Cleanup dport removal with a devres group

In preparation for adding more setup actions like RAS register mapping,
introduce a devres group to collect all the dport creation / registration
actions. This replaces the maintenance tedium of open coding several
devm_release_action() calls in del_dport().

Tested-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260131000403.2135324-4-dan.j.williams@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>