Add support for booting of INTEGRITY operating system uImages

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/include/image.h b/include/image.h
index 9be806e..4654485 100644
--- a/include/image.h
+++ b/include/image.h
@@ -85,6 +85,7 @@
 #define IH_OS_RTEMS		18	/* RTEMS	*/
 #define IH_OS_ARTOS		19	/* ARTOS	*/
 #define IH_OS_UNITY		20	/* Unity OS	*/
+#define IH_OS_INTEGRITY		21	/* INTEGRITY	*/
 
 /*
  * CPU Architecture Codes (supported by Linux)