Without SD card the shutdown sequence was delayed

If the memory card is not inserted (or removed) from
the phone the shut down process is very long. It
takes almost 24 seconds. For the phone with memory
card the averige is 5-6 seconds

Make sure to send onShutDownComplete even if an SD
card is not mounted and no unmount is done.

Change-Id: I0e79b82e294a971f5e7144cdd3cc16b7ff414b9c