ARM: Kirkwood: Add setup file for netxbig LEDs

There is currently no DT binding for the CPLD which controls the LEDs
on the Net 2Big and Net 5Big. So use a platform device.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1401132591-26305-2-git-send-email-andrew@lunn.ch


Tested-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>