virtio-9p: Use 9P specific Lock constants

Use 9P specific lock constants instead of arch specific lock constants.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
diff --git a/hw/9pfs/virtio-9p.h b/hw/9pfs/virtio-9p.h
index 60b8a56..e5cf78c 100644
--- a/hw/9pfs/virtio-9p.h
+++ b/hw/9pfs/virtio-9p.h
@@ -352,6 +352,11 @@
     V9fsString fullname;
 } V9fsMkState;
 
+/* 9P2000.L lock type */
+#define P9_LOCK_TYPE_RDLCK 0
+#define P9_LOCK_TYPE_WRLCK 1
+#define P9_LOCK_TYPE_UNLCK 2
+
 #define P9_LOCK_SUCCESS 0
 #define P9_LOCK_BLOCKED 1
 #define P9_LOCK_ERROR 2