Improve USB Storage handling

Change-Id: I5743d9b967a8227c4bb87da01a9c67c574bf9876
Support Qualcomm overlay graphics in recovery

Change-Id: Ia75c34ab1a45b7c8802c902906198517aa3437d5
Merge changes Ia75c34ab,I5743d9b9 into android-4.4

* changes:
  Support Qualcomm overlay graphics in recovery
  Improve USB Storage handling