dt-bindings: altera: document Stratix 10 based board compatibles

Add new compatible for Stratix 10 based boards.
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: NDinh Nguyen <dinguyen@kernel.org>

Documentation/devicetree/bindings/arm/altera.yaml

@@ -43,6 +43,12 @@ properties:
           - const: altr,socfpga-cyclone5
           - const: altr,socfpga
 
+      - description: Stratix 10 boards
+        items:
+          - enum:
+              - altr,socfpga-stratix10-socdk
+          - const: altr,socfpga-stratix10
+
       - description: SoCFPGA VT
         items:
           - const: altr,socfpga-vt