dt-bindings: fpga: add Stratix10 SoC FPGA manager binding

Add a Device Tree binding for the Intel Stratix10 SoC FPGA manager.

Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Richard Gong <richard.gong@intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>