Update git submodules

* Update platform/ndk from branch 'master'
  to a50af24eea726ee0f34825bf1f25b84dea028488
  - Merge "Fix bad pylint annotation."
  - Fix bad pylint annotation.
    
    Test: ./checkbuild.py pylint
    Bug: None
    Change-Id: I4054ee513b245e5a45ccbb11b9b0689c516dc826
    
1 file changed