Revert "HALO notification should open in floating window mode"

This reverts commit ebee203e7eef3855ac15679539e3ec967cd82272.
Revert "Frameworks: Prevetn Multi-Window If HALO is enabled"

This reverts commit e2f9bf8435453a88cac2cec256a6794d74bccd3b.
Frameworks: prevent multiwindow if halo enabled
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.
mutliwindow: notify split view if layout changed
mutliwindow: notify split view if layout changed [2/2]