drm/msm: common display interface for mdp driver

Display_manager.h provides a commong display interface for
MDP driver to query DSI, HDMI and DP display properties.

This is a replacement for the previous dsi-manager component.

Change-Id: Ifdd213b3341ca3c21ca13aca4e56d9c2404030ff
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
Signed-off-by: Narendra Muppalla <narendram@codeaurora.org>