x86: vmx: remove xfail from invalid APIC-access page tests

KVM disables "virtualize APIC-accesses" if the APIC-access page
cannot be mapped (the feature is effectively disabled anyways if
the guest can't access the page), i.e. KVM doesn't incorrectly
signal VMFail on a legal-but-unbacked APIC-access page.

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