drm/msm/dsi-staging: add dsc support to dsi driver

Patch adds display stream compression support to dsi driver
for both video and command modes. Calculates dsc parameters
and sends PPS to the panel. Provides dsc configuration
settings to msm drm driver.

Change-Id: Ib5baf52e8ba5f5c3c9b6e439f86efd6d7c6397d1
Signed-off-by: Alexander Beykun <abeykun@codeaurora.org>
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>