crypto: hisilicon/hpre - optimize registration of ecdh

Use table to store the different ecdh curve configuration,
making the registration of ecdh clearer and expansion more
convenient.

Signed-off-by: Zhiqi Song <songzhiqi1@huawei.com>
Signed-off-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>