Camellia: Tweaks for AES-NI implementations
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Camellia: Tweaks for AES-NI implementations

* cipher/camellia-aesni-avx-amd64.S: Align stack to 16 bytes; tweak
key-setup for small speed up.
* cipher/camellia-aesni-avx2-amd64.S: Use vmovdqu even with aligned
stack; reorder vinsert128 instructions; use rbp for stack frame.

Use of 'vmovdqa' with ymm registers produces quite interesting scattering in
measurement timings. By using 'vmovdqu' instead, repeated measuments produce
more stable results.