bus: Add DT bindings for Integrator/AP logic modules

This adds YAML device tree bindings for the Integrator/AP
logic modules. These are plug-in tiles used typically for
FPGA prototyping.

Reviewed-by: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20200320134524.52140-1-linus.walleij@linaro.org


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>