target: Add WRITE_VERIFY_16

This patch addresses clients who needs write_verify_16 for
large volume groups such as AIX.

Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/include/scsi/scsi_proto.h b/include/scsi/scsi_proto.h
index 6ba66e0..ce78ec8 100644
--- a/include/scsi/scsi_proto.h
+++ b/include/scsi/scsi_proto.h
@@ -112,6 +112,7 @@
 #define WRITE_16              0x8a
 #define READ_ATTRIBUTE        0x8c
 #define WRITE_ATTRIBUTE	      0x8d
+#define WRITE_VERIFY_16	      0x8e
 #define VERIFY_16	      0x8f
 #define SYNCHRONIZE_CACHE_16  0x91
 #define WRITE_SAME_16	      0x93