Actually remove the device id from events.

unbrek tree by syncing protoypes to hotplug.c

new field at end of struct, discussed with theo

Include device id in hotplug events. This will be used by ntpd to check
sensors on attach/detach. hotplugd changes following in a minute.

ok henning.

branches: 1.1.2;
Devices hot plugging support.
The hotplug pseudo-device passes device attachment and detachment events
to userland. When a device attaches or detaches, the corresponding event
is queued. The events can then be obtained from the queue through the
read(2) call on the /dev/hotplug device file. Each event consists of
event type (attach/detach), device class (DV_*) and device name (sd1 e.g.).

We have hotplug pseudo-device on alpha, amd64, i386, macppc and sparc64.
Since it was tested only on i386 other archs has it commented out
in GENERIC until tested.

The idea liked peter@ tedu@ drahn@ millert@ marco@ henning@.
Ok deraadt@.