pcm030: fix out-of-tree building

Commit 0a87dd90 that was supposed to fix out-of-tree building for the
pcm030 board was unfortunately incomplete.

Signed-off-by: Wolfgang Denk <wd@denx.de>

Makefile

@@ -696,6 +696,7 @@ o2dnt_config:	unconfig
 
 pcm030_config \
 pcm030_LOWBOOT_config:	unconfig
+	@mkdir -p $(obj)include $(obj)board/phytec/pcm030
 	@ >$(obj)include/config.h
 	@[ -z "$(findstring LOWBOOT_,$@)" ] || \
 		{ echo "TEXT_BASE = 0xFF000000"	>$(obj)board/phytec/pcm030/config.tmp ; \