Merge changes from topic \'27176738-pmsg-write-core\'
am: 593a5c1

* commit '593a5c1573c8e5f0cc0d5312c3f1cc5ba8e17169':
  liblog: add __android_log_pmsg_file_read
  liblog: add __android_log_pmsg_file_write
  liblog: split out transports into separate files