Change Z_MAX for kas-ffc #632
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From what I can tell, Z-MAX for KAS-FFC-SSC is 2048 bits, not 4096. tc->z is initiated with ACVP_KAS_FFC_BYTE_MAX, which is 2048. This was causing a possible undefined behavior situation for memcpy copying past the boundaries of the tc alloc, which made safeC issue warnings.
Tested with no issues on more than 1 vector set.