x86/microcode/AMD: Use the family,model,stepping encoded in the patch ID

On Zen and newer, the family, model and stepping is part of the
microcode patch ID so that the equivalence table the driver has been
using, is not needed anymore.

So switch the driver to use that from now on.

The equivalence table in the microcode blob should still remain in case
there's need to pass some additional information to the kernel loader.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240725112037.GBZqI1BbUk1KMlOJ_D@fat_crate.local