disp: msm: sde: pre-downscale support for inline rotation v2

Add support for enabling pre-downscale block to increase the
maximum downscale capability for true inline rotation use cases.

Change-Id: Ifa544bb0ae69439abef4bd427134290090fe7230
Signed-off-by: Steve Cohen <cohens@codeaurora.org>
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>