libbase output in host now look similar to the logcat output on device

I8189501d123fb79a255e17f675f8f6be617022e8 changed the output format of
host-side liblog. This change does the same for libbase.

For some unknown reason I don't fully understand, libbase has formatted
host-side logs by itself without relying on liblog. (note that libbase
"always" depends on liblog even for hosts. A follow-up might be reduce
the code duplication across libbase and liblog.

Bug: 287910948
Test: see the host logs
Test: atest --host libbase_test:logging_splitters
Test: atest --host libbase_test:logging
Test: atest --host libblog-host-test
Change-Id: I1325c881cbf91d72ecfc682e88d7334cecbc34c3
1 file changed
tree: efe662d4c5a67d8c01f4b16f04e1197ab0c34ec7
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/
  5. rust/
  6. OWNERS
  7. PREUPLOAD.cfg
  8. TEST_MAPPING