drm/msm: clear colorimetry block info for HDMI

SDE connector stores the information related to the HDMI
colorimetry data block. This connector information is
retained till the connector is destroyed which does not
happen across hotplug.

Clear the HDMI colorimetry block related data fields when
the bridge is disabled so that across a hotplug stale
information is not retained.

Change-Id: I2333af8835af98f78934df056301648e1cb6f8be
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>