crypto: Support multiple nonce lengths for AES-CCM.

[jhb]

Summary

Permit nonces of lengths 7 through 13 in the OCF framework and the
cryptosoft driver. A helper function (ccm_max_payload_length) can be
used in OCF drivers to reject CCM requests which are too large for the
specified nonce length.

Sponsored by: Chelsio Communications, The FreeBSD Foundation

[jhb]

The cryptosoft changes were tested both by cryptocheck and the updated crypotest.py at the end of the series that tested all the AES-CCM KAT vectors. Note that the KAT vectors also required later fixes for truncated tags, however, cryptocheck was able to verify variable nonce lengths with a 16 byte tag.