drm/msm/sde: update drm plane with initial status

If continuous splash is enabled, this change provides
drm plane initial status with the connected crtc to client.
Onus is on client to make sure underlying pipe usage is not
switched to any other crtc before hand-off of the specific
display. This change also validates source address of the
staged sspp against the splash memory of the display.

Change-Id: I52989381a43eefb4c8bbb6b7c2afb43fcf3823d5
Signed-off-by: Prabhanjan Kandula <pkandula@codeaurora.org>