HALO notification should open in floating window mode
Change-Id: I9625bb505c78b361fcb618c7a3b23105568b8d5c
PS1: If HALO is activated all HALO notifications will open in floating window mode. If HALO is not activated notifications will open in mutiwimdow mode.
PS2: If HALO is activated "add to split view" in the recent application list will not be shown.

Conflicts:
core/java/android/inputmethodservice/InputMethodService.java
packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java