1. Add curve 25519 parameters in 'crypto/ecc_curve_defs.h';
2. Add curve25519 interface 'ecc_get_curve25519_param' in
   'include/crypto/ecc_curve.h', to make its parameters be
   exposed to everyone in kernel tree.
Signed-off-by: NMeng Yu <yumeng18@huawei.com>
Reviewed-by: NZaibo Xu <xuzaibo@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>