am 6d51d9ca: system/core: vold: Change permission of external storage device nodes

Merge commit '6d51d9ca81ac2c406f4e20be40a9cddad8362e1a'

* commit '6d51d9ca81ac2c406f4e20be40a9cddad8362e1a':
  system/core: vold: Change permission of external storage device nodes