nVMX: Extend EPTP test to allow 5-level EPT

Modify the EPTP test to expect success when the EPTP is configured for
5-level page walks and 5-level walks are enumerated as supported by the
EPT capabilities MSR.  KVM is in the process of gaining support for
5-level nested EPT[*].

[*] https://lkml.kernel.org/r/20200206220836.22743-1-sean.j.christopherson@intel.com



Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200207174244.6590-2-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>