am 8d450c66: Merge "Add missing <string.h> include."

* commit '8d450c66545b819aff582c033b6a7de0ff04c905':
  Add missing <string.h> include.
tree: b1e44dfe4777f56051efbe5052e6f63088760c52
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/