mtd: mtdpart: default to cmdlinepart, NULL partitions probing

Lots of MTD devices default to cmdlinepart, NULL as partition parsing
order. Make it a default.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

drivers/mtd/mtdpart.c

@@ -712,12 +712,17 @@ int deregister_mtd_parser(struct mtd_part_parser *p)
 }
 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
 
+static const char *default_mtd_part_types[] = {"cmdlinepart", NULL};
+
 int parse_mtd_partitions(struct mtd_info *master, const char **types,
 			 struct mtd_partition **pparts, unsigned long origin)
 {
 	struct mtd_part_parser *parser;
 	int ret = 0;
 
+	if (!types)
+		types = default_mtd_part_types;
+
 	for ( ; ret <= 0 && *types; types++) {
 		parser = get_partition_parser(*types);
 		if (!parser && !request_module("%s", *types))