drm/msm/sde: add dsi debug bus control register list

Add the dsi debug bus control register list for latest
platforms, which will be beneficial for triaging stability
issues in dsi driver.

Change-Id: Id359843e08262644faea9de8f9b2cef0b63d9ff0
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>