* cipher/rijndael-armv8-ce.c (_gcry_aes_armv8_ce_setkey): New key
schedule with simplified structure and less stack usage.
* cipher/rijndael-internal.h (RIJNDAEL_context_s): Add
'keyschedule32b'.
(keyschenc32b): New.
* cipher/rijndael-ppc-common.h (vec_u32): New.
* cipher/rijndael-ppc.c (vec_bswap32_const): Remove.
(_gcry_aes_sbox4_ppc8): Optimize for less instructions emitted.
(keysched_idx): New.
(_gcry_aes_ppc8_setkey): New key schedule with simplified structure.
* cipher/rijndael-tables.h (rcon): Remove.
* cipher/rijndael.c (sbox4): New.
(do_setkey): New key schedule with simplified structure and less
stack usage.