drm/msm/sde: add exclusion rect support

Add exclusion rect support for DRM planes. The hardware avoids fetching
data for the excluded region for pipe. This feature is supported from
SDE 4.0 for both linear and UBWC RGB formats. The programming changes
for exclusion rect related to multirect will be done as part of
multirect changes.

Change-Id: Id07ca491d6913fc04589eca47a1019d0b124adbe
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>