x86/bugs: Remove X86_BUG_MMIO_UNKNOWN

Whack this thing because:

- the "unknown" handling is done only for this vuln and not for the
  others

- it doesn't do anything besides reporting things differently. It
  doesn't apply any mitigations - it is simply causing unnecessary
  complications to the code which don't bring anything besides
  maintenance overhead to what is already a very nasty spaghetti pile

- all the currently unaffected CPUs can also be in "unknown" status so
  there's no need for special handling here

so get rid of it.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: David Kaplan <david.kaplan@amd.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Link: https://lore.kernel.org/r/20250414150951.5345-1-bp@kernel.org