KVM: x86: Sort CPUID_8000_0021_EAX leaf bits properly

WRMSR_XX_BASE_NS is bit 1 so put it there, add some new bits as
comments only.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250324160617.15379-1-bp@kernel.org


[sean: skip the FSRS/FSRC placeholders to avoid confusion]
Signed-off-by: Sean Christopherson <seanjc@google.com>