drm/msm/sde: add support to adjust safe lut per fill level

Add support to configure different safe luts for different
fill levels and adjust the fill level calculation as per
recommendation.

Change-Id: I4c48b14d741cc7a305471ad9e2e9c9323a18ac46
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>