rijndael-ppc: use vector registers for key schedule calculations
* cipher/rijndael-ppc.c (_gcry_aes_sbox4_ppc8): Remove. (bcast_u32_to_vec, u32_from_vec): New. (_gcry_aes_ppc8_setkey): Use vectors for round key calculation variables.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>