KVM: x86: use static_call_cond for optional callbacks

SVM implements neither update_emulated_instruction nor
set_apic_access_page_addr.  Remove an "if" by calling them
with static_call_cond().
Reviewed-by: NSean Christopherson <seanjc@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/x86.c

@@ -8421,8 +8421,7 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 			kvm_rip_write(vcpu, ctxt->eip);
 			if (r && (ctxt->tf || (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)))
 				r = kvm_vcpu_do_singlestep(vcpu);
-			if (kvm_x86_ops.update_emulated_instruction)
-				static_call(kvm_x86_update_emulated_instruction)(vcpu);
+			static_call_cond(kvm_x86_update_emulated_instruction)(vcpu);
 			__kvm_set_rflags(vcpu, ctxt->eflags);
 		}
 
@@ -9791,10 +9790,7 @@ static void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
 	if (!lapic_in_kernel(vcpu))
 		return;
 
-	if (!kvm_x86_ops.set_apic_access_page_addr)
-		return;
-
-	static_call(kvm_x86_set_apic_access_page_addr)(vcpu);
+	static_call_cond(kvm_x86_set_apic_access_page_addr)(vcpu);
 }
 
 void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu)