crypto: atmel - drop pointless static qualifier in atmel_aes_probe()

There is no need to have the 'struct atmel_aes_dev *aes_dd' variable
static since new value always be assigned before use it.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>