drm/msm/dp: remove delayed_workqueue for DP connect_work

With the new Display framework approach, the connector status
is checked on boot-up/framework reboot and hotplug notification
is not needed. Avoid deferral of connect_work till framework
comes up and skip hotplug notification.

Change-Id: I637550e3dc3bb146ba2d6b9d4fdd70f01061b41e
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>