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/common/image.c b/common/image.c
index 32ad4da..1538256 100644
--- a/common/image.c
+++ b/common/image.c
@@ -93,6 +93,7 @@
 	{	IH_ARCH_SPARC64,	"sparc64",	"SPARC 64 Bit",	},
 	{	IH_ARCH_BLACKFIN,	"blackfin",	"Blackfin",	},
 	{	IH_ARCH_AVR32,		"avr32",	"AVR32",	},
+	{	IH_ARCH_NDS32,		"nds32",	"NDS32",	},
 	{	-1,			"",		"",		},
 };