drm/msm/dp: add vcpi parameter for set_stream_info

Introduce a new parameter for set_stream_info function to pass
virtual channel id, vcpi, information from dp_mst layers to
dp_display and dp_panel modules. dp_display and dp_panel modules
need vcpi information for mst, mst-dsc and mst-hdcp use-cases.

Change-Id: Ic8c21223928e3da234a4e9f59e798a3786a037da
Signed-off-by: Govinda Rajulu Chenna <gchenna@codeaurora.org>
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>