keystore: change migrate to duplicate

After discussion, it was determined that duplicate would be less
disruptive and it still fit in the current HAL model.

Change-Id: Id6ff97bfa5ec4cca9def177677263e9be1c9619f
3 files changed
tree: d7207b8544ceb80d07fb5a0033caffce57292459
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/