Improve logging and attribution in TouchMonitor.

This changelist updates the logging in TouchMonitor to be exclusive done
through logger. It also ensures that the InputSession is attributed to
the proper logging name, rather than always dream overlay.

Test: manual - verified logging references matched logging name.
Flag: EXEMPT bugfix
Bug: 367549056
Change-Id: Ie79a59fa4819ee81d65baad3186900baa2f76ce9