scsi: remove MSG_*_TAG defines

For SPI drivers use the message definitions from scsi.h, and for target
drivers introduce a new TCM_*_TAG namespace.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 50610a6..e999496e 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -606,7 +606,7 @@
 	init_waitqueue_head(&tmr->tmr_wait);
 
 	transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
-		tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, MSG_SIMPLE_TAG,
+		tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG,
 		&pending_req->sense_buffer[0]);
 
 	rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);