cpu_data(cpu) evaluates to a struct cpuinfo_x86 filled with attributes of the given CPU number. The CPU number is an index in the __cpu_data[] array with MAXCPU entries. On FreeBSD, we simply initialize all of them like we do with boot_cpu_data.
While here, we add the x86_model field to the struct cpuinfo_x86. We use CPUID_TO_MODEL() to set it.
At the same time, we fix the value of x86 which should have been set to the CPU family. It was using the same implementation as CPUID_TO_MODEL() before. It now uses CPUID_TO_FAMILY().
This is part of the update of the DRM drivers to Linux 5.15.