recovery: remove empty postrecoveryboot script

Change-Id: Ie6993ac800182256dffe0186a8c03dae2a54b904
init: Add setup_fs service for userdata

* Used for formatting data after unlock,
  as the userdata partition is zeroed out after unlock,
  but a filesystem isn't created.

Change-Id: I17aba9ed9778431e48f9605d10a7fde8be9b7b86