Update git submodules

* Update system/apex from branch 'master'
  to 2efadc0b5eb967f54d60cb4796c60adeb09c9d32
  - Apexd: Move away from unique_ptr
    
    Use StatusOr as the RAII container, and use move semantics.
    This commit prepares apexd internals, mostly.
    
    Test: atest apexservice_test
    Change-Id: I55d229891e65eda2640b1cfa9b76dc7818ffb94b
    
1 file changed