kernel: Enable AEAD cipher modes for 4708 devices

This adds modules for the CCM and GCM modes for use in IPsec.
Because there are quite a few supporting modules required, these
modes are only enabled along with IPsec.

CCM and GCM were introduced in linux version 2.6.24, so they are
only available on ARM devices.
kernel: Enable XCBC MAC algorithm by default

Suggested in RFC 4835 for IPsec