dt-bindings: add Atmel SHA204A I2C crypto processor

Add a compatible string for the Atmel SHA204A I2C crypto processor.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -52,6 +52,8 @@ properties:
           - at,24c08
             # i2c trusted platform module (TPM)
           - atmel,at97sc3204t
+            # i2c h/w symmetric crypto module
+          - atmel,atsha204a
             # CM32181: Ambient Light Sensor
           - capella,cm32181
             # CM3232: Ambient Light Sensor