isci: unify isci_remote_device and scic_sds_remote_device

Remove the distinction between these two implementations and unify on
isci_remote_device (local instances named idev).

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h
index 68d8a27..ca64ea2 100644
--- a/drivers/scsi/isci/request.h
+++ b/drivers/scsi/isci/request.h
@@ -146,7 +146,7 @@
 	struct completion *io_request_completion;
 	struct sci_base_state_machine sm;
 	struct scic_sds_controller *owning_controller;
-	struct scic_sds_remote_device *target_device;
+	struct isci_remote_device *target_device;
 	u16 io_tag;
 	enum sci_request_protocol protocol;
 	u32 scu_status; /* hardware result */
@@ -501,7 +501,7 @@
 				     struct isci_remote_device *idev);
 enum sci_status
 scic_task_request_construct(struct scic_sds_controller *scic,
-			    struct scic_sds_remote_device *sci_dev,
+			    struct isci_remote_device *idev,
 			    u16 io_tag,
 			    struct isci_request *ireq);
 enum sci_status