apic: do not accept SIPI on the bootstrap processor

SIPI interrupts are ignored on the bootstrap.  Never accept one.

Cc: Andreas Faerber <afaerber@suse.de>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/intc/apic_common.c

@@ -200,7 +200,7 @@ void apic_init_reset(DeviceState *dev)
     s->initial_count = 0;
     s->initial_count_load_time = 0;
     s->next_time = 0;
-    s->wait_for_sipi = 1;
+    s->wait_for_sipi = !cpu_is_bsp(s->cpu);
 
     if (s->timer) {
         timer_del(s->timer);