scsi: ibmvfc: flush rport_add_work_q during driver teardown

INIT_WORK is called on rport_add_work_q during driver probe. When the
adapter is removed, ibmvfc_remove() stops the work thread and proceeds
to tear down the FC host, but any work item queued via schedule_work()
that raced the teardown could still be running or pending in the
system workqueue.

Add a flush_work() call after kthread_stop() and before fc_remove_host()
to drain any outstanding rport add work before the FC host and its rports
are torn down.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Link: https://patch.msgid.link/20260723000149.969416-3-tyreld@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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