nds32: common bdinfo, bootm, image support

Add support of NDS32 to common commands bdinfo, bootm, and image format.

Signed-off-by: Macpaul Lin <macpaul@andestech.com>
diff --git a/include/image.h b/include/image.h
index b7caaa6..2ec31bd 100644
--- a/include/image.h
+++ b/include/image.h
@@ -107,6 +107,7 @@
 #define IH_ARCH_AVR32		17	/* AVR32	*/
 #define IH_ARCH_ST200	        18	/* STMicroelectronics ST200  */
 #define IH_ARCH_SANDBOX		19	/* Sandbox architecture (test only) */
+#define IH_ARCH_NDS32	        19	/* ANDES Technology - NDS32  */
 
 /*
  * Image Types