KVM: x86/pmu: remove useless prototype

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/pmu.h

@@ -191,7 +191,6 @@ void kvm_pmu_cleanup(struct kvm_vcpu *vcpu);
 void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
 int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp);
 void kvm_pmu_trigger_event(struct kvm_vcpu *vcpu, u64 perf_hw_id);
-void kvm_init_pmu_capability(void);
 
 bool is_vmware_backdoor_pmc(u32 pmc_idx);