x86/cpu/vfm: Delete all the *_FAM6_ CPU #defines

All code has been converted to use the vendor/family/model versions.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240903173443.7962-4-tony.luck@intel.com