drm/amd/display: hook up DCN20 color blocks data to DTN log

Color caps changed between HW versions, which caused the DCN10 color
state sections in the DTN log to no longer match DCN2+ state. Create a
color state log specific to DCN2.0 and hook it up to DCN2 family
drivers. Instead of reading gamut remap reg values, display gamut remap
matrix data in fixed 31.32.

Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>