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_device.h b/drivers/scsi/isci/remote_device.h
index 0d9e37f..6ac5dfb 100644
--- a/drivers/scsi/isci/remote_device.h
+++ b/drivers/scsi/isci/remote_device.h
@@ -120,7 +120,7 @@
 	 * used only for SATA requests since the unsolicited frames we get from the
 	 * hardware have no Tag value to look up the io request object.
 	 */
-	struct scic_sds_request *working_request;
+	struct isci_request *working_request;
 
 	/**
 	 * This field contains the reason for the remote device going not_ready.  It is
@@ -466,17 +466,17 @@
 enum sci_status scic_sds_remote_device_start_io(
 	struct scic_sds_controller *controller,
 	struct scic_sds_remote_device *sci_dev,
-	struct scic_sds_request *io_request);
+	struct isci_request *ireq);
 
 enum sci_status scic_sds_remote_device_start_task(
 	struct scic_sds_controller *controller,
 	struct scic_sds_remote_device *sci_dev,
-	struct scic_sds_request *io_request);
+	struct isci_request *ireq);
 
 enum sci_status scic_sds_remote_device_complete_io(
 	struct scic_sds_controller *controller,
 	struct scic_sds_remote_device *sci_dev,
-	struct scic_sds_request *io_request);
+	struct isci_request *ireq);
 
 enum sci_status scic_sds_remote_device_suspend(
 	struct scic_sds_remote_device *sci_dev,