[SCSI] Unify SAM_ and SAM_STAT_ macros

We have two separate definitions for identical constants with nearly the
same name.  One comes from the generic headers in scsi.h; the other is
an enum in libsas.h ... it's causing confusion about which one is
correct (fortunately they both are).

Fix this by eliminating the libsas.h duplicate

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 3b58685..d06e13b 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -422,16 +422,7 @@
 };
 
 enum exec_status {
-	SAM_GOOD         = 0,
-	SAM_CHECK_COND   = 2,
-	SAM_COND_MET     = 4,
-	SAM_BUSY         = 8,
-	SAM_INTERMEDIATE = 0x10,
-	SAM_IM_COND_MET  = 0x12,
-	SAM_RESV_CONFLICT= 0x14,
-	SAM_TASK_SET_FULL= 0x28,
-	SAM_ACA_ACTIVE   = 0x30,
-	SAM_TASK_ABORTED = 0x40,
+	/* The SAM_STAT_.. codes fit in the lower 6 bits */
 
 	SAS_DEV_NO_RESPONSE = 0x80,
 	SAS_DATA_UNDERRUN,