drm/i915: Split chv_load_cgm_csc() into pieces

Split chv_cgm_csc_convert_ctm() out from chv_load_cgm_csc() so
that we have functions with clear jobs. This is also how the ilk+
code is already structured.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230329135002.3096-4-ville.syrjala@linux.intel.com


Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>