Switch OCF and IPsec over to the new AES

ok djm

convert bcopy to memcpy. from david hill

Update copyright information

Pass AES_GMAC context as a void pointer to cut down on casts in xform.c

Allow overriding ghash_update() with an optimized MD function. Use
this on amd64 to provide a version that uses the PCLMUL instruction
on CPUs that support it but don't have AESNI. ok mikeb@

Instead of multiplying with 0..1, extend the bit into a mask and do an AND.
The same technique was already used a few lines above. ok mikeb@

Improve performance of an internal loop by saving up on branching
Pointed out by John-Mark Gurney <jmg at funkthat ! com>, thanks!

in AES_GMAC_Final(), explicitly clear the local buffer
ok mikeb

use a well established define instead of rolling our own; no binary change

OCF support for the Galois/Counter Mode (GCM) for AES as
described in FIPS SP 800-38D.

This implementation supports 16 byte authentication tag only,
splitting transformation into two parts: encryption and
authentication. Encryption is handled by the existing
AES-CTR implementation, while authentication requires new
AES_GMAC hash function.

Additional routine is added to the software crypto driver
to deal with peculiarities of a combined authentication-
encryption transformation.

With suggestions from reyk, naddy and toby.