dt-bindings: arm: npcm: Add nuvoton,npcm845 compatible string

Add a compatible string for Nuvoton BMC NPCM845 SoC and a board specific
device tree for the NPCM845 (Arbel) evaluation board.
Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/arm/npcm/npcm.yaml

@@ -27,4 +27,10 @@ properties:
               - nuvoton,npcm750-evb         # NPCM750 evaluation board
           - const: nuvoton,npcm750
 
+      - description: NPCM845 based boards
+        items:
+          - enum:
+              - nuvoton,npcm845-evb         # NPCM845 evaluation board
+          - const: nuvoton,npcm845
+
 additionalProperties: true