The Intel Keem Bay SoC can provide hardware acceleration of Elliptic
Curve Cryptography (ECC) by means of its Offload and Crypto Subsystem
(OCS).

Add the Keem Bay OCS ECC driver which leverages such hardware
capabilities to provide hardware-acceleration of ECDH-256 and ECDH-384.
Signed-off-by: NPrabhjot Khurana <prabhjot.khurana@intel.com>
Co-developed-by: NDaniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: NDaniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>