hpet: add API to find it

Add API to find HPET using QOM.

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/timer/hpet.c

@@ -757,6 +757,11 @@ static void hpet_device_class_init(ObjectClass *klass, void *data)
     dc->props = hpet_device_properties;
 }
 
+bool hpet_find(void)
+{
+    return object_resolve_path_type("", TYPE_HPET, NULL);
+}
+
 static const TypeInfo hpet_device_info = {
     .name          = TYPE_HPET,
     .parent        = TYPE_SYS_BUS_DEVICE,

include/hw/timer/hpet.h

@@ -71,4 +71,6 @@ struct hpet_fw_config
 } QEMU_PACKED;
 
 extern struct hpet_fw_config hpet_cfg;
+
+bool hpet_find(void);
 #endif