msm: mdss: hdmi: modify HPD polarity change setup

If HDMI cable is disconnected before changing HPD polarity to
detect disconnection, HDMI HW is unable to detect HPD change thus
no HPD disconnection interrupt is being triggered. Change the HPD
polarity to detect disconnection right after receiving HPD connection
event. Also synchronize the HPD event notifications to display HAL.

Change-Id: I0c46907cefa6a2ef328c546921e5d98a7bd4c6fd
Signed-off-by: Narender Ankam <nankam@codeaurora.org>