ppc4xx: Fix out-of-tree building of CPCI405 variants

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Acked-by: Stefan Roese <sr@denx.de>

Makefile

@@ -1248,6 +1248,7 @@ CPCI405_config:		unconfig
 CPCI4052_config		\
 CPCI405DT_config	\
 CPCI405AB_config:	unconfig
+	@mkdir -p $(obj)board/esd/cpci405
 	@echo "TEXT_BASE = 0xFFFC0000" > $(obj)board/esd/cpci405/config.tmp
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx cpci405 esd