Eleven: Postpone initializing the queue until after boot

* If the service starts too early, which it does during boot now, we
  get a crash due to VOLUME_EXTERNAL not yet being valid
* We can simply postpone this to after boot by simply just waiting
  for ACTION_MEDIA_MOUNTED - which already does the reloading anyway

Change-Id: I78ce1fe3df8c88f6a6974d8d699c89c03d3d708d