ARM: orion5x: move interrupt controller node into ocp

The interrupt controller node was located outside of the ocp@f1000000
node, which doesn't make much sense: like any other device, the
interrupt controller has registers located in the "Internal Registers
Window", so it is much more logical to have it under the ocp@f1000000
node.

It is even more important as we are going to move Orion5x to use the
Device Tree binding of the mvebu-mbus driver.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1398202002-28530-11-git-send-email-thomas.petazzoni@free-electrons.com
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>