tools/padjffs2: use Host/Prepare/Default instead of raw commands

Now that Host/Prepare/Default is always defined, we can use that instead
of using raw commands to move files from the src directory to
HOST_BUILD_DIR.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

tools/padjffs2/Makefile

@@ -13,8 +13,7 @@ PKG_RELEASE:=1
 include $(INCLUDE_DIR)/host-build.mk
 
 define Host/Prepare
-	mkdir -p $(HOST_BUILD_DIR)
-	$(CP) ./src/* $(HOST_BUILD_DIR)/
+	$(call Host/Prepare/Default)
 	find $(HOST_BUILD_DIR) -name .svn | $(XARGS) rm -rf
 endef