[SCSI] ses: update enclosure data on hot add

Now that hot add works correctly, if a new device is added, we're still
operating on stale enclosure data, so fix that by updating the enclosure
diagnostic pages when we get notified of a device hot add

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>