Move error_prone config to external/error_prone
am: e6e85f9b4f

Change-Id: I4449fa85601171b474fcf2768cef8bb31cff0f24
tree: 8b001ef07604fd442fc23631720cbec51a1b99d6
  1. checkerframework/
  2. error_prone/
  3. javac/
  4. jFormatString/
  5. soong/
  6. Android.bp