KVM: VXM: Remove temporary WARN on expected vs. actual EPTP level mismatch

Remove the WARN in vmx_load_mmu_pgd() that was temporarily added to aid
bisection/debug in the event the current MMU's shadow root level didn't
match VMX's computed EPTP level.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200716034122.5998-7-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>