This creates a node in the device tree to hold the FPGA devices
as a "simple-bus" and moves the GIC found on the FPGA to this
node, so it reflects the actual topology of the system.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

As a first example, add device tree and bindings for the
RealView PB1176.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>