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fix(tdx): work around missing SIGNIFICANT_INDEX flag in KVM_TDX_CAPABILITIES

The KvmCpuidEntry2 structures returned by KVM_TDX_CAPABILITIES currently
omit the SIGNIFICANT_INDEX flag. This causes the CPUID index to be
parsed as None instead of the actual index value, which breaks CPUID
capability matching.

Until this is fixed in the upstream kernel (see
https://lore.kernel.org/all/20260223214336.722463-1-changyuanl@google.com/),
work around the issue by explicitly retaining the index value from
KvmCpuidEntry2 when parsing the capabilities.

Fixes: ca9a64b8636b ("feat(tdx): initialize TDX VMs with supported CPUID features")
Signed-off-by: Changyuan Lyu <changyuanl@google.com>

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