liblog: only allow one transport for reading

liblog has left over code from local_logger that allows for reading
from multiple sources and merging the contents.  Since we've already
removed local_logger, this change removes the rest of this code.

Test: liblog-unit-tests
Change-Id: I5685ad6c1e7cbcaa0a660ed10f47714784a40791
9 files changed
tree: aca7fea84bd048622db44e35a5eb0f3bf48152e4
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/