libbase: Have LogdLogger use LOGGER_ENTRY_MAX_PAYLOAD for its buffer

LogdLogger has its own buffer for adding the file and line number to
FATAL messages, but it is much lower than LOGGER_ENTRY_MAX_PAYLOAD and
that causes problems now that more logs are piped through this logger,
so increase the limit to maximum.

Also, in the case that the file and line number are not added, simply
pass the buffer through to liblog, since there is no reason to copy to
a separate buffer.

Bug: 148678509
Test: build, unit tests
Change-Id: I064aa34641e784dca6c529c51cb192069821d64a