drm/msm: Clear HDMI VSDB and VCDB info across hotplug

SDE connector stores the information related to the HDMI
VSDB and VCDB data blocks. This connector information is
retained till the connector is destroyed which does not
happen across hotplug.

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

Change-Id: I4dabfda03a6446f38913ac45d9df2d2ae411a7f0
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>