Update git submodules

* Update system/gatekeeper from branch 'master'
  to 5cfa62ca294b8657da639aaa9b50a0368cec2fbf
  - Moved contents of clang_cflags into cflags
    
    Test: Treehugger
    Bug: 226636335
    Change-Id: I147840c5a19c788294d8c9a2b552a911fdc2751d
    
1 file changed