brcm63xx: do not require fixed partitions when probing from DT

Allow the parser to be invoked from DT without fixed cfe/linux/nvram
partitions. This allows flash to be probed from DT also for multi
flash-size images.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/patches-4.4/425-bcm63xxpart_parse_paritions_from_dt.patch

@@ -342,7 +342,7 @@
 +				    struct mtd_partition **pparts,
 +				    struct mtd_part_parser_data *data)
 +{
-+	if (mtd_get_of_node(master))
++	if (mtd_get_of_node(master) && of_get_child_count(mtd_get_of_node(master)))
 +		return bcm63xx_parse_cfe_partitions_of(master, pparts, data);
 +	else
 +		return bcm63xx_parse_cfe_partitions(master, pparts, data);