Update git submodules

* Update trusty/user/app/gatekeeper from branch 'master'
  to f87a786fb962347d86a76c26e3a2e0f68ee7883e
  - Avoid GK memory leak
    
    GetAuthTokenKey is intended to retain ownership of the returned key. To
    follow this, we cache the result of speaking to keymaster.
    
    Bug: 129768470
    Bug: 140434850
    Bug: 131618642
    Change-Id: I36965eed01296c0f13d93f9dac7520bdc8006fb3
    
1 file changed