dt-bindings: intel: add binding for Intel n6000

Add the binding string for the Agilex based Intel n6000 board.
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

Documentation/devicetree/bindings/arm/intel,socfpga.yaml

@@ -18,6 +18,7 @@ properties:
         items:
           - enum:
               - intel,n5x-socdk
+              - intel,socfpga-agilex-n6000
               - intel,socfpga-agilex-socdk
           - const: intel,socfpga-agilex