ppc4xx: Add support for AMCC 405EP Taihu board

Signed-off-by: John Otken <john@softadvances.com>
diff --git a/Makefile b/Makefile
index 3af9962..d4fd34e 100644
--- a/Makefile
+++ b/Makefile
@@ -1254,6 +1254,9 @@
 sc3_config:unconfig
 	@./mkconfig $(@:_config=) ppc ppc4xx sc3
 
+taihu_config:	unconfig
+	@$(MKCONFIG) $(@:_config=) ppc ppc4xx taihu amcc
+
 taishan_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx taishan amcc