Update git submodules

* Update prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9 from branch 'master'
  to 42e5864a7d23921858ca8541d52028ff88acb2b6
  - Add default code reviewers into OWNERS
    
    Bug: 33166666
    Test: gerrit uploader
    Change-Id: I630ee65726ce0b7c691061d2b138be7ed27e3ddf
    
1 file changed