Add support for Network Space v2 and parents

This patch add support for the Network Space v2 board and parents, based
on the Marvell Kirkwood 6281 SoC. This include Network Space (Max) v2
and Internet Space v2.

Additional information is available at:
http://lacie-nas.org/doku.php?id=network_space_v2



Signed-off-by: Simon Guinot <sguinot@lacie.com>