KVM: x86: cull apicv code when userspace irqchip is requested

Currently apicv_active can be true even if in-kernel LAPIC
emulation is disabled.  Avoid this by properly initializing
it in kvm_arch_vcpu_init, and then do not do anything to
deactivate APICv when it is actually not used

(Currently APICv is only deactivated by SynIC code that in turn
is only reachable when in-kernel LAPIC is in use.  However, it is
cleaner if kvm_vcpu_deactivate_apicv avoids relying on this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>