Revert "Invoke organizer events when a display is added / removed."

This reverts commit 2e6a09ef3ccec44137c915cad791637631035a85.

Reason for revert: Causing NPE in the system server

Bug: 176951238
Bug: 175653536
Change-Id: I2f13558950b1032fea21cf64ba50b0910210e428
3 files changed