ipc_logging: Refactor LogPage_v1.sortAndLink()

LogPage_v1.sortAndLink() has excessive cyclomatic complexity. Reduce the
complexity by refactoring sortAndLink() into several smaller functions.

This commit is to be squashed into the commit containing all other
style fixes.

Change-Id: I52ac6027e5f9d45af7d44d4b24beff7a28baea05