drm/msm/dsi-staging: add support for DSI ctrl version 2.2

Add support to DSI controller version 2.2. Clamp control register has
been mapped into disp_cc register map from DSI controller version 2.2.
This change adds support for new clamp control register configuration.

Change-Id: If1cab26c4acdff2da498fd9e22e6d53676e8815f
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>