camellia.c: Prepare for AES-NI/AVX implementation

* cipher/camellia-glue.c (CAMELLIA_encrypt_stack_burn_size)
(CAMELLIA_decrypt_stack_burn_size): Increase stack burn size.
* cipher/camellia.c (CAMELLIA_ROUNDSM): Move key-material mixing in
the front.
(camellia_setup128, camellia_setup256): Remove now unneeded
key-material mangling.
(camellia_encrypt128, camellia_decrypt128, amellia_encrypt256)
(camellia_decrypt256): Copy block to stack, so that compiler can
optimize it for register usage.

Camellia implementation needs to be modified slightly for compatibility with
AES-NI/AVX version.

Before:
Running each test 100 times.

   ECB/Stream         CBC             CFB             OFB             CTR
--------------- --------------- --------------- --------------- ---------------

CAMELLIA128 800ms 790ms 840ms 730ms 810ms 800ms 820ms 820ms 730ms 740ms
CAMELLIA192 1040ms 1040ms 1030ms 930ms 1000ms 1000ms 1020ms 1020ms 940ms 930ms
CAMELLIA256 1000ms 980ms 1040ms 930ms 1010ms 990ms 1040ms 1040ms 940ms 930ms

After:
Running each test 100 times.

   ECB/Stream         CBC             CFB             OFB             CTR
--------------- --------------- --------------- --------------- ---------------

CAMELLIA128 780ms 750ms 810ms 690ms 780ms 770ms 810ms 810ms 700ms 690ms
CAMELLIA192 1020ms 990ms 1000ms 890ms 970ms 970ms 990ms 1000ms 890ms 900ms
CAMELLIA256 960ms 960ms 1000ms 900ms 970ms 970ms 990ms 1010ms 900ms 890ms

• Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>