dt-bindings: soc: add bindings for Intel HPS Copy Engine
Add device tree bindings documentation for the Intel Hard Processor System (HPS) Copy Engine. Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>