arc: bdinfo, image and arc-specific init functions declarations support

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Francois Bedard <fbedard@synopsys.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Heiko Schocher <hs@denx.de>
diff --git a/common/image.c b/common/image.c
index ae95c3f..9c6bec5 100644
--- a/common/image.c
+++ b/common/image.c
@@ -82,6 +82,7 @@
 	{	IH_ARCH_OPENRISC,	"or1k",		"OpenRISC 1000",},
 	{	IH_ARCH_SANDBOX,	"sandbox",	"Sandbox",	},
 	{	IH_ARCH_ARM64,		"arm64",	"AArch64",	},
+	{	IH_ARCH_ARC,		"arc",		"ARC",		},
 	{	-1,			"",		"",		},
 };