dt-bindings: crypto: add sam9x7 in Atmel SHA

Add DT bindings for atmel SHA.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>