OF: base: convert and remove device_node_for_nach_child ...

Remove device_node_for_nach_child and convert users to corresponding
imported OF API functions.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: partitions: create bb device for nand flashes ...

For nand flashes automatically create a bb device for each partion.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: partitions: pass struct cdev as argument ...

pass a struct cdev instead of the cdev name to of_parse_partitions.
This is available to the caller anyway and makes it easier to use
additional stuff from the cdev (like knowing whether it's a mtd
device).

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: Add devicetree partition parsing ...

Helper code to probe mtd partitions from the devicetree.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>