isci: unify isci_request and scic_sds_request

They are one in the same object so remove the distinction.  The near
duplicate fields (owning_controller, and isci_host) will be cleaned up
after the scic_sds_contoller isci_host unification.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c
index 0e84e29..bd09154 100644
--- a/drivers/scsi/isci/port.c
+++ b/drivers/scsi/isci/port.c
@@ -1611,7 +1611,7 @@
 
 enum sci_status scic_sds_port_start_io(struct scic_sds_port *sci_port,
 				       struct scic_sds_remote_device *sci_dev,
-				       struct scic_sds_request *sci_req)
+				       struct isci_request *ireq)
 {
 	enum scic_sds_port_states state;
 
@@ -1631,7 +1631,7 @@
 
 enum sci_status scic_sds_port_complete_io(struct scic_sds_port *sci_port,
 					  struct scic_sds_remote_device *sci_dev,
-					  struct scic_sds_request *sci_req)
+					  struct isci_request *ireq)
 {
 	enum scic_sds_port_states state;