Use devicetree to define NAND partitions. Use D-link partition scheme by
default, to be vaguely compatible with their userland.

Changes since last submission (V4):-
* Don't add NAND support then throw it away immediately after [Grant Likely]
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NJason Cooper <jason@lakedaemon.net>
Signed-off-by: NJamie Lentin <jm@lentin.co.uk>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>

Add support for the DNS-320 and DNS-325. Describe as much as currently possible
in the devicetree files, create a board-dnskw.c for everything else.

Changes since last submission (V3) [Addressing comments by]:-

* One MACH_DLINK_KIRKWOOD_DT for all dtb files [Grant Likely, Jason Cooper]
* Drop brain-dead select "select CONFIG_MTD_OF_PARTS" [Grant Likely]
* Don't add NAND support then throw it away immediately after [Grant Likely]
* Describe purpose of MPP 41, 42 & 49

Changes since last submission (V2):-

* Use IEEE-compliant "okay", rather than "ok" [Scott Wood]
Signed-off-by: NJamie Lentin <jm@lentin.co.uk>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>