dt-bindings: rng: atmel,at91-trng: add sam9x7 TRNG

Add compatbile for Microchip sam9x7 TRNG.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/rng/atmel,at91-trng.yaml

@@ -21,6 +21,10 @@ properties:
           - enum:
               - microchip,sama7g5-trng
           - const: atmel,at91sam9g45-trng
+      - items:
+          - enum:
+              - microchip,sam9x7-trng
+          - const: microchip,sam9x60-trng
 
   clocks:
     maxItems: 1