Update git submodules

* Update trusty/user/app/gatekeeper from branch 'master'
  to 8fa6f1ac0562e91be2c68b1afc8a357ab634962c
  - Eliminate the use of status_t.
    
    status_t is a kernel type that should not be used in userspace.
    
    Bug: 110161494
    Change-Id: Idf54e319d715f452a8f6a757ace972b752f4bc70
    
diff --git a/trusty/user/app/gatekeeper b/trusty/user/app/gatekeeper
index 82f9107..8fa6f1a 160000
--- a/trusty/user/app/gatekeeper
+++ b/trusty/user/app/gatekeeper
@@ -1 +1 @@
-Subproject commit 82f9107a0a0d057212b4e62ff5b3772845b4ab24
+Subproject commit 8fa6f1ac0562e91be2c68b1afc8a357ab634962c