Revert "New hooks for external integration to notification intiialization"

No usecase has been provided, and additionally the hooks
are not documented. Bartosz also points out that
mw.hook calls are asynchronous and memorized.

This reverts commit 9d3561afaf67811f622c317c90dbf09a6d8b9cbc.

Change-Id: If735b46996fab3def835a54223412ef6d3105395
Merge "Revert "New hooks for external integration to notification intiialization""