message: [openthread] set runtime data file path
  The default path is under temporary directory, which doesn't persist
  across reboots.
diff: @@ -46,5 +46,7 @@ list(APPEND OT_PRIVATE_DEFINES "-DOPENTHREAD_CONFIG_LOG_LEVEL=OT_LOG_LEVEL_INFO"
  list(APPEND OT_PRIVATE_DEFINES "-DOPENTHREAD_CONFIG_MAX_STATECHANGE_HANDLERS=3")
  list(APPEND OT_PRIVATE_DEFINES "-DOPENTHREAD_CONFIG_MLE_STEERING_DATA_SET_OOB_ENABLE=1")
  +list(APPEND OT_PLATFORM_DEFINES "-DOPENTHREAD_CONFIG_POSIX_SETTINGS_PATH=\"/var/lib/thread\"")
  +
  add_subdirectory(repo EXCLUDE_FROM_ALL)
  