kvm tools: don't exit on debug ioport write

kvm tools: don't exit on debug ioport write

While it shouldn't happen on regular guests, we sometimes hit it when fuzzing
within the guest, which would cause the lkvm process to exit - which is
undesired.

Our PIT tests were using the debug port to trigger a reboot. Instead of using
that port we now use the reboot line of our i8042 controller.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>