ppc4xx: Add initial AMCC Makalu 405EX support

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/Makefile b/Makefile
index ba96ca1..039cec0 100644
--- a/Makefile
+++ b/Makefile
@@ -1177,6 +1177,9 @@
 lwmon5_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx lwmon5
 
+makalu_config:	unconfig
+	@$(MKCONFIG) $(@:_config=) ppc ppc4xx makalu amcc
+
 METROBOX_config: unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx metrobox sandburst