Add PPC4xx-HCU4 and HCU5 boards: make related

Signed-off-by: Niklaus Giger <niklaus.giger@netstal.com>
diff --git a/Makefile b/Makefile
index 3af9962..04c2c02 100644
--- a/Makefile
+++ b/Makefile
@@ -1134,6 +1134,12 @@
 G2000_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx g2000
 
+hcu4_config:	unconfig
+	@./mkconfig $(@:_config=) ppc ppc4xx hcu4 netstal
+
+hcu5_config:	unconfig
+	@./mkconfig $(@:_config=) ppc ppc4xx hcu5 netstal
+
 HH405_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx hh405 esd