Use lapic_in_kernel() in kvm_vcpu_apicv_active() to take advantage of the
kvm_has_noapic_vcpu static branch.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220614230548.3852141-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>