liblog: correct new APIs per the API review

1) Rename __android_logger_data to __android_log_message and rename
   __android_log_write_logger_data to
   __android_log_write_log_message. Move the const char* message
   argument into __android_log_message.
2) Add @param, @return, and "Available since API level 30." to the
   documentation of new functions.
3) Document that the user defined aborter should but may not abort.
4) Document the line separation is the responsibility of the log
   function provided to __android_log_set_logger().

Bug: 150898477
Test: build, liblog and libbase unit tests
Change-Id: I07c41011ef25b3e7cc4943f3f1e240a2f6aa2802