Revert "msm_fb: display: Fix for HDMI bootup issue"

This reverts commit a369ce03ca048fb511642ac1cb73c1f652d70c50.

The change is no more required as pan_update is not being called
and overlay set is now being used instead.

Change-Id: I7b25c256ab57e620f319058638371e079642c448
CRs-Fixed: 367233
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>