x86/kvm: remove unused ack_notifier callbacks

Commit f5244726 ("KVM: irq ack notification") introduced an
ack_notifier() callback in struct kvm_pic and in struct kvm_ioapic
without using them anywhere. Remove those callbacks again.
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-Id: <20211117071617.19504-1-jgross@suse.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/ioapic.h

@@ -81,7 +81,6 @@ struct kvm_ioapic {
 	unsigned long irq_states[IOAPIC_NUM_PINS];
 	struct kvm_io_device dev;
 	struct kvm *kvm;
-	void (*ack_notifier)(void *opaque, int irq);
 	spinlock_t lock;
 	struct rtc_status rtc_status;
 	struct delayed_work eoi_inject;

arch/x86/kvm/irq.h

@@ -56,7 +56,6 @@ struct kvm_pic {
 	struct kvm_io_device dev_master;
 	struct kvm_io_device dev_slave;
 	struct kvm_io_device dev_elcr;
-	void (*ack_notifier)(void *opaque, int irq);
 	unsigned long irq_states[PIC_NUM_PINS];
 };