[SCSI] sas: unify the pointlessly separated enums sas_dev_type and sas_device_type

These enums have been separate since the dawn of SAS, mainly because the
latter is a procotol only enum and the former includes additional state
for libsas.  The dichotomy causes endless confusion about which one you
should use where and leads to pointless warnings like this:

drivers/scsi/mvsas/mv_sas.c: In function 'mvs_update_phyinfo':
drivers/scsi/mvsas/mv_sas.c:1162:34: warning: comparison between 'enum sas_device_type' and 'enum sas_dev_type' [-Wenum-compare]

Fix by eliminating one of them.  The one kept is effectively the sas.h
one, but call it sas_device_type and make sure the enums are all
properly namespaced with the SAS_ prefix.

Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/aic94xx/aic94xx_hwi.c b/drivers/scsi/aic94xx/aic94xx_hwi.c
index 81b736c..4df867e 100644
--- a/drivers/scsi/aic94xx/aic94xx_hwi.c
+++ b/drivers/scsi/aic94xx/aic94xx_hwi.c
@@ -74,7 +74,7 @@
 
 	memset(phy->identify_frame, 0, sizeof(*phy->identify_frame));
 
-	phy->identify_frame->dev_type = SAS_END_DEV;
+	phy->identify_frame->dev_type = SAS_END_DEVICE;
 	if (phy->sas_phy.role & PHY_ROLE_INITIATOR)
 		phy->identify_frame->initiator_bits = phy->sas_phy.iproto;
 	if (phy->sas_phy.role & PHY_ROLE_TARGET)