Move binding back to constructor

The bindings need to exist even when lockscreen is not showing. We need
the bindings also when phone is unlocked and in shade.

Fixes: 323965777
Test: unlock phone and look at notifications.
Flag:  ACONFIG com.android.systemui.scene_container DEVELOPMENT

Change-Id: Iea1d8b4ac5e9deb9e05c91caceb02278474e3c92