i386/cpu: Drop CPUID 0x2 specific cache info in X86CPUState

i386/cpu: Drop CPUID 0x2 specific cache info in X86CPUState

With the pre-defined cache model legacy_intel_cpuid2_cache_info,
for X86CPUState there's no need to cache special cache information
for CPUID 0x2 leaf.

Drop the cache_info_cpuid2 field of X86CPUState and use the
legacy_intel_cpuid2_cache_info directly.

Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Tested-by: Yi Lai <yi1.lai@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250711102143.1622339-7-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>