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/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index b6774bc..1b51fe5 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -598,7 +598,7 @@
 }
 
 enum sci_status scic_sds_remote_node_context_start_io(struct scic_sds_remote_node_context *sci_rnc,
-							     struct scic_sds_request *sci_req)
+							     struct isci_request *ireq)
 {
 	enum scis_sds_remote_node_context_states state;
 
@@ -623,7 +623,7 @@
 }
 
 enum sci_status scic_sds_remote_node_context_start_task(struct scic_sds_remote_node_context *sci_rnc,
-							struct scic_sds_request *sci_req)
+							struct isci_request *ireq)
 {
 	enum scis_sds_remote_node_context_states state;