ARM: Kirkwood: Add DT descriptions for net2big and net5big.

Describe LaCie 2Big and 5Big Network v2 using device tree.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lkml.kernel.org/r/1401132591-26305-3-git-send-email-andrew@lunn.ch


Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>