am 25b15be9: init: use tmpfs/ftruncate for properties backing store instead of ashmem

Merge commit '25b15be9120bcdaa0aba622c67ad2c835d9e91ca' into gingerbread-plus-aosp

* commit '25b15be9120bcdaa0aba622c67ad2c835d9e91ca':
  init: use tmpfs/ftruncate for properties backing store instead of ashmem