Revert "Changed alert window notifications to use single channel"

This reverts commit 8f7bebca3656f4993edef290e62c960f245ff373.

We now want multiple channels so the user can disable which ever ones they like.

Change-Id: I6015cd5f1e3f37a8a01e1db42b57a94087780304
Fixes: 38428796
Bug: 37422870
3 files changed