Use fc_exch_mgr_list_clone to setup em for npiv port.

Also remove redundant vport and lport initializations.
Signed-off-by: NVasu Dev <vasu.dev@intel.com>
Acked-by: NBhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>