x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature

The "Processor ignores nested data breakpoints" feature was being
open-coded for KVM.  Add the feature to its newly introduced CPUID leaf
0x80000021 EAX proper.

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-4-kim.phillips@amd.com