target/arm/cpu64: Validate sve vector lengths are supported

Future CPU types may specify which vector lengths are supported.
We can apply nearly the same logic to validate those lengths
as we do for KVM's supported vector lengths. We merge the code
where we can, but unfortunately can't completely merge it because
KVM requires all vector lengths, power-of-two or not, smaller than
the maximum enabled length to also be enabled. The architecture
only requires all the power-of-two lengths, though, so TCG will
only enforce that.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210823160647.34028-5-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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