x86/bugs: Restructure L1TF mitigation

Restructure L1TF to use select/apply functions to create consistent
vulnerability handling.

Define new AUTO mitigation for L1TF.

Signed-off-by: David Kaplan <david.kaplan@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/20250418161721.1855190-16-david.kaplan@amd.com