scsi: ufs: delete unused structure filed tr

Delete unused structure field tr in structure utp_upiu_req, since no person
uses it for task management.

Fixes: df032bf2 ("scsi: ufs: Add a bsg endpoint that supports UPIUs")
Link: https://lore.kernel.org/r/20191205220912.5696-1-huobean@gmail.comReviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/uapi/scsi/scsi_bsg_ufs.h

@@ -68,14 +68,13 @@ struct utp_upiu_cmd {
  * @header:UPIU header structure DW-0 to DW-2
  * @sc: fields structure for scsi command DW-3 to DW-7
  * @qr: fields structure for query request DW-3 to DW-7
+ * @uc: use utp_upiu_query to host the 4 dwords of uic command
  */
 struct utp_upiu_req {
 	struct utp_upiu_header header;
 	union {
 		struct utp_upiu_cmd		sc;
 		struct utp_upiu_query		qr;
-		struct utp_upiu_query		tr;
-		/* use utp_upiu_query to host the 4 dwords of uic command */
 		struct utp_upiu_query		uc;
 	};
 };