KVM: Drop unused kvm_vcpu.pre_pcpu field

Remove kvm_vcpu.pre_pcpu as it no longer has any users.  No functional
change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20211208015236.1616697-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/linux/kvm_host.h

@@ -309,7 +309,6 @@ struct kvm_vcpu {
 	u64 requests;
 	unsigned long guest_debug;
 
-	int pre_pcpu;
 	struct list_head blocked_vcpu_list;
 
 	struct mutex mutex;

virt/kvm/kvm_main.c

@@ -427,7 +427,6 @@ static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 #endif
 	kvm_async_pf_vcpu_init(vcpu);
 
-	vcpu->pre_pcpu = -1;
 	INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
 
 	kvm_vcpu_set_in_spin_loop(vcpu, false);