i386/tdx: Add supported CPUID bits relates to XFAM

i386/tdx: Add supported CPUID bits relates to XFAM

Some CPUID bits are controlled by XFAM. They are not covered by
tdx_caps.cpuid (which only contians the directly configurable bits), but
they are actually supported when the related XFAM bit is supported.

Add these XFAM controlled bits to TDX supported CPUID bits based on the
supported_xfam.

Besides, incorporate the supported_xfam into the supported CPUID leaf of
0xD.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-48-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>