keystore: remove unused using statement

Test: pass
Bug: 36099713
Change-Id: I8f7e1559ce2dafbffee3d7c36083bf9a6307917f
1 file changed
tree: 960362694eadcafe9be44622f7a30254ab012302
  1. keystore/
  2. keystore-engine/
  3. softkeymaster/
  4. MODULE_LICENSE_APACHE2
  5. NOTICE