keystore: command to clear all keys for UID

Add ability for system UID to clear all entries for a different UID.

(cherry picked from commit a9bb549868035e05450a9b918f8d7de9deca5343)

Bug: 3020069
Change-Id: Ibd5ce287f024b89df3dd7bfc3a4e5f979a34c75c
3 files changed
tree: 9512dc9f8f17d658c18e66e32c1085215737cdc8
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/