dt-bindings: Add Arm corstone1000 platform

Add bindings to describe the FPGA in a prototyping board
(MPS3) implementation and the Fixed Virtual Platform
implementation of the ARM Corstone1000 platform.

Link: https://lore.kernel.org/r/20220408131922.3864348-2-rui.silva@linaro.org


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>