ARM: orion5x: add Device Bus description at SoC level

This commit adds the necessary SoC-level Device Tree definitions to
describe the Device Bus of Orion5x SOCs. The Device Bus is mainly used
to connect NOR flashes to the system.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1398202002-28530-27-git-send-email-thomas.petazzoni@free-electrons.com


Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>