crypto/aesni_gcm: support CPU crypto

crypto/aesni_gcm: support CPU crypto

Add support for CPU crypto mode by introducing required handler.
Authenticated encryption and decryption are supported with tag
generation/verification.

CPU crypto support include both AES-GCM and GMAC algorithms.

Signed-off-by: Marcin Smoczynski <marcinx.smoczynski@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
Tested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>