Revert "KVM: x86/mmu: Zap only TDP MMU leafs in kvm_zap_gfn_range()"

Revert "KVM: x86/mmu: Zap only TDP MMU leafs in kvm_zap_gfn_range()"

This reverts commit 30cd9dfe3d5876def4de33c2d3c8082384707b71.

Multi-vCPU Hyper-V guests started crashing randomly on boot with the
latest kvm/queue and the problem can be bisected the problem to this
particular patch. Basically, I'm not able to boot e.g. 16-vCPU guest
successfully anymore. Both Intel and AMD seem to be affected. Reverting
the commit saves the day.

Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>