Merge changes from topic \'27176738-pmsg-write-core\' am: 593a5c1
am: ba485f6

* commit 'ba485f62a8d7bd1ec806637bafc4b3297c6bb074':
  liblog: add __android_log_pmsg_file_read
  liblog: add __android_log_pmsg_file_write
  liblog: split out transports into separate files