Remove ZVA 128 support from memset - the new memset no longer
guarantees count >= 256, which can result in underflow and a
crash if ZVA size is 128 ([1]). Since only one CPU uses a ZVA
size of 128 and its memcpy implementation was removed in commit
e162ab2bf1, remove this special
case too.
[1] https://sourceware.org/pipermail/libc-alpha/2024-November/161626.html
Reviewed-by: Andrew Pinski <quic_apinski@quicinc.com>
a08d9a52f9