drm/msm/dp: add panel as input parameter to dp_display_ops

Add dp_panel as one of the input parameter to dp_display_ops,
those are dealing with stream specific configurations.
dp_display module uses panel parameter to extract the stream
specific information to configure the stream specific hw modules.

CRs-Fixed: 2192818
Change-Id: I7ea6c4315238dddd3d2f4413eaa620841343d6ad
Signed-off-by: Govinda Rajulu Chenna <gchenna@codeaurora.org>