Now that the fast invalidate mechanism has been reintroduced, restore
the tracepoint associated with said mechanism.

Note, the name of the tracepoint deviates from the original tracepoint
so as to match KVM's current nomenclature.

This reverts commit 42560fb1.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>