openrisc: Add architecture image support

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
diff --git a/include/image.h b/include/image.h
index 466c980..bbf80f0 100644
--- a/include/image.h
+++ b/include/image.h
@@ -108,6 +108,7 @@
 #define IH_ARCH_ST200	        18	/* STMicroelectronics ST200  */
 #define IH_ARCH_SANDBOX		19	/* Sandbox architecture (test only) */
 #define IH_ARCH_NDS32	        20	/* ANDES Technology - NDS32  */
+#define IH_ARCH_OPENRISC        21	/* OpenRISC 1000  */
 
 /*
  * Image Types