KVM: remove useless function declaration kvm_inject_pit_timer_irqs()

Just remove useless function define kvm_inject_pit_timer_irqs() from
file arch/x86/kvm/i8254.h

Signed-off-by:Duan Jiong<djduanjiong@gmail.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/x86/kvm/i8254.h

@@ -50,7 +50,6 @@ struct kvm_pit {
 #define KVM_MAX_PIT_INTR_INTERVAL   HZ / 100
 #define KVM_PIT_CHANNEL_MASK	    0x3
 
-void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
 void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val, int hpet_legacy_start);
 struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags);
 void kvm_free_pit(struct kvm *kvm);