am bbf4093e: am 46ef2b87: add free space on system and cache to free_storage_left log event

Merge commit 'bbf4093e7a04f6c61c12bc51d07f03c6b58f4142' into eclair-plus-aosp

* commit 'bbf4093e7a04f6c61c12bc51d07f03c6b58f4142':
  add free space on system and cache to free_storage_left log event