KVM: VMX: Convert feature updates from CPUID to KVM cpu caps

Use the recently introduced KVM CPU caps to propagate VMX-only (kernel)
settings to supported CPUID flags.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>