x86/bugs: Add SRSO_MITIGATION_NOSMT

AMD Zen1 and Zen2 CPUs with SMT disabled are not vulnerable to SRSO.

Instead of overloading the X86_FEATURE_SRSO_NO bit to indicate this,
define a separate mitigation to make the code cleaner.

Signed-off-by: David Kaplan <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Borislav Petkov (AMD) <[email protected]>
Cc: H . Peter Anvin <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Pawan Gupta <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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