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

Add a compatible string for Nuvoton BMC NPCM845 RNG.
Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/rng/nuvoton,npcm-rng.yaml

@@ -16,7 +16,9 @@ maintainers:
 
 properties:
   compatible:
-    const: nuvoton,npcm750-rng
+    enum:
+      - nuvoton,npcm750-rng
+      - nuvoton,npcm845-rng
 
   reg:
     maxItems: 1