crypto/openssl: update key and algo during session init

Key and algo are added in the openssl ctx during
session initialization instead of adding it for
each packet, since it remains constant for that session,
improving the performance.

Signed-off-by: Akhil Goyal <akhil.goyal@nxp.com>
Reviewed-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>