crypto: ecdh - extend 'cra_driver_name' with curve name

Currently, 'cra_driver_name' cannot be used to specify ecdh algorithm
with a special curve, so extending it with curve name.

Although using 'cra_name' can also specify a special curve, but ecdh
generic driver cannot be specified when vendor hardware accelerator
has registered.

Fixes: 6763f5ea ("crypto: ecdh - move curve_id of ECDH from ...")
Signed-off-by: Hui Tang <tanghui20@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>